version: 1.0.182

Resolves a query compilation bug in JSPG where reverse/incoming polymorphic
edges (where edge.forward == false, e.g. pet ➡️ cover_attachment) mistakenly
appended the destination type constraint to the parent query's WHERE clause
(e.g., producing `entity_1.type = 'attachment'` on a pet entity query,
causing it to match 0 rows and return null).

- Modifies `compile_polymorphic_bounds` in `compiler.rs` to only compile
  type checks when `edge.forward` is true. For reverse edges, the parent's
  type check does not belong on the parent table and is already implicitly
  restricted by parent ID joins.
- Updates the `fk_attachment_attachable_entity` relation in the queryer test
  fixture to correctly model a two-column polymorphic relation, ensuring
  this code path is exercised by the unit test suite.

GEMINI.md

@@ -240,6 +240,7 @@ For example, given a general `attachment` table containing a `kind` column (e.g.
   "type": "attachment",
   "properties": {
     "kind": {
+      "type": "string",
       "const": "cover"
     }
   }
@@ -252,10 +253,7 @@ A parent entity can then define a relationship using this constrained schema und
 "cover_attachment": {
   "properties": {
     "cover_attachment": {
-      "type": [
-        "cover.attachment",
-        "null"
-      ]
+      "type": "cover.attachment"
     }
   }
 }
@@ -316,13 +314,13 @@ The Merger provides an automated, high-performance graph synchronization engine.
 
 ### Core Features
 
-*   **Caching Strategy**: The Merger leverages the native `compiled_edges` permanently cached onto the Schema AST via `OnceLock` to instantly resolve Foreign Key mapping graphs natively in absolute `O(1)` time. It additionally utilizes the concurrent `GLOBAL_JSPG` application memory (`DashMap`) to cache statically constructed SQL `SELECT` strings used during deduplication (`lk_`) and difference tracking calculations.
+*   **Caching Strategy**: The Merger leverages the native `compiled_edges` permanently cached onto the Schema AST via `OnceLock` to instantly resolve Foreign Key mapping graphs natively in absolute `O(1)` time. It additionally utilizes the concurrent `GLOBAL_JSPG` application memory (`DashMap`) to cache statically constructed SQL `SELECT` strings used during deduplication (`lookup_fields`) and difference tracking calculations.
 *   **Deep Graph Merging**: The Merger walks arbitrary levels of deeply nested JSON schemas (e.g. tracking an `order`, its `customer`, and an array of its `lines`). It intelligently discovers the correct parent-to-child or child-to-parent Foreign Keys stored in the registry and automatically maps the UUIDs across the relationships during UPSERT.
 *   **Prefix Foreign Key Matching**: Handles scenario where multiple relations point to the same table by using database Foreign Key constraint prefixes (`fk_`). For example, if a schema has `shipping_address` and `billing_address`, the merger resolves against `fk_shipping_address_entity` vs `fk_billing_address_entity` automatically to correctly route object properties.
-*   **Dynamic Deduplication & Lookups**: If a nested object is provided without an `id`, the Merger utilizes Postgres `lk_` index constraints defined in the schema registry (e.g. `lk_person` mapped to `first_name` and `last_name`). It dynamically queries these unique matching constraints to discover the correct UUID to perform an UPDATE, preventing data duplication.
+*   **Dynamic Deduplication & Lookups**: If a nested object is provided without an `id`, the Merger utilizes custom `lookup_fields` declared directly in the schema registry JSON comments. It validates at setup compile-time that a corresponding unique index exists in PostgreSQL for these fields. When merging, it dynamically builds query predicates for any satisfied `lookup_fields` sets in the entity's type hierarchy (checking child-to-parent hierarchies order-independently and combining satisfied keys with `UNION` queries) to discover the correct UUID to perform an UPDATE, preventing data duplication.
 *   **Hierarchical Table Inheritance**: The Punc system uses distributed table inheritance (e.g. `person` inherits `user` inherits `organization` inherits `entity`). The Merger splits the incoming JSON payload and performs atomic row updates across *all* relevant tables in the lineage map.
 *   **The Archive Paradigm**: Data is never deleted in the Punc system. The Merger securely enforces referential integrity by toggling the `archived` Boolean flag on the base `entity` table rather than issuing SQL `DELETE` commands.
-*   **Change Tracking & Reactivity**: The Merger diffs the incoming JSON against the existing database row (utilizing static, `DashMap`-cached `lk_` SELECT string templates). Every detected change is recorded into the `agreego.change` audit table, tracking the user mapping. It then natively uses `pg_notify` to broadcast a completely flat row-level diff out to the Go WebSocket server for O(1) routing.
+*   **Change Tracking & Reactivity**: The Merger diffs the incoming JSON against the existing database row (utilizing static, `DashMap`-cached `lookup` SELECT string templates). Every detected change is recorded into the `agreego.change` audit table, tracking the user mapping. It then natively uses `pg_notify` to broadcast a completely flat row-level diff out to the Go WebSocket server for O(1) routing.
 *   **Flat Structural Beats (Unidirectional Flow)**: The Merger purposefully DOES NOT trace or hydrate outbound Foreign Keys or nested parent structures during writes. It emits completely flat, mathematically perfect structural deltas via `pg_notify` representing only the exact Postgres rows that changed. This guarantees the write-path remains O(1) lightning fast. It is the strict responsibility of the upstream Punc Framework (the Go `Speaker`) to intercept these flat beats, evaluate them against active Websocket Schema Topologies, and dynamically issue targeted `jspg_query` reads to hydrate the exact contextual subgraphs required by listening clients.
 *   **Pre-Order Notification Traversal**: To support proper topological hydration on the upstream Go Framework, the Merger decouples the `pg_notify` execution from the physical database write execution. The engine collects structural changes and explicitly fires `pg_notify` SQL statements in strict **Pre-Order** (Parent -> Relations -> Children). This guarantees that WebSocket clients receive the parent entity `Beat` prior to any nested child entities, ensuring stable unidirectional data flows without hydration race conditions.
 *   **Many-to-Many Graph Edge Management**: Operates seamlessly with the global `agreego.relationship` table, allowing the system to represent and merge arbitrary reified M:M relationships directionally between any two entities.

fixtures/contains.json

@@ -227,8 +227,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "0"
+                "count": "0",
+                "limit": "1"
               },
               "details": {
                 "path": "",
@@ -268,8 +268,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "0"
+                "count": "0",
+                "limit": "1"
               },
               "details": {
                 "path": "",
@@ -347,8 +347,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "0"
+                "count": "0",
+                "limit": "1"
               },
               "details": {
                 "path": "",
@@ -373,8 +373,8 @@
             {
               "code": "MULTIPLE_OF_VIOLATED",
               "values": {
-                "multiple_of": "2",
-                "value": "3"
+                "value": "3",
+                "multiple_of": "2"
               },
               "details": {
                 "path": "0",
@@ -384,8 +384,8 @@
             {
               "code": "MULTIPLE_OF_VIOLATED",
               "values": {
-                "multiple_of": "2",
-                "value": "9"
+                "value": "9",
+                "multiple_of": "2"
               },
               "details": {
                 "path": "2",
@@ -432,8 +432,8 @@
             {
               "code": "MULTIPLE_OF_VIOLATED",
               "values": {
-                "multiple_of": "2",
-                "value": "1"
+                "value": "1",
+                "multiple_of": "2"
               },
               "details": {
                 "path": "0",

fixtures/database.json

@@ -62,8 +62,8 @@
               "code": "EDGE_MISSING",
               "values": {
                 "parent_type": "org",
-                "property_name": "missing_users",
-                "child_type": "user"
+                "child_type": "user",
+                "property_name": "missing_users"
               },
               "details": {
                 "path": "full.org/missing_users",
@@ -151,8 +151,8 @@
             {
               "code": "EDGE_MISSING",
               "values": {
-                "child_type": "child",
                 "parent_type": "parent",
+                "child_type": "child",
                 "property_name": "children"
               },
               "details": {
@@ -470,8 +470,8 @@
             {
               "code": "DATABASE_TYPE_PARSE_FAILED",
               "values": {
-                "reason": "invalid type: sequence, expected a string",
-                "type": "failure"
+                "type": "failure",
+                "reason": "invalid type: sequence, expected a string"
               },
               "details": {
                 "context": "failure"
@@ -911,9 +911,7 @@
               "archived"
             ]
           },
-          "lookup_fields": [
-            "id"
-          ],
+          "lookup_fields": [],
           "historical": true,
           "relationship": false,
           "field_types": {
@@ -1018,5 +1016,100 @@
         }
       }
     ]
+  },
+  {
+    "description": "Validation - lookup fields without matching index",
+    "database": {
+      "types": [
+        {
+          "id": "22222222-2222-2222-2222-222222222222",
+          "type": "type",
+          "name": "user",
+          "module": "test",
+          "source": "test",
+          "hierarchy": ["user"],
+          "variations": ["user"],
+          "fields": ["id", "email"],
+          "lookup_fields": ["email"],
+          "schemas": {
+            "user": {
+              "type": "object",
+              "properties": {
+                "id": { "type": "string", "format": "uuid" },
+                "email": { "type": "string", "format": "email" }
+              }
+            }
+          }
+        }
+      ]
+    },
+    "tests": [
+      {
+        "description": "Fails setup compilation with MISSING_LOOKUP_INDEX if unique index is missing",
+        "action": "compile",
+        "expect": {
+          "success": false,
+          "errors": [
+            {
+              "code": "MISSING_LOOKUP_INDEX",
+              "values": {
+                "type": "user",
+                "lookup_fields": "[\"email\"]"
+              },
+              "details": {
+                "path": "/types/user",
+                "schema": "user"
+              }
+            }
+          ]
+        }
+      }
+    ]
+  },
+  {
+    "description": "Validation - lookup fields with matching index",
+    "database": {
+      "indexes": [
+        {
+          "table": "user",
+          "columns": ["email"]
+        }
+      ],
+      "types": [
+        {
+          "id": "22222222-2222-2222-2222-222222222222",
+          "type": "type",
+          "name": "user",
+          "module": "test",
+          "source": "test",
+          "hierarchy": ["user"],
+          "variations": ["user"],
+          "fields": ["id", "email"],
+          "lookup_fields": ["email"],
+          "schemas": {
+            "user": {
+              "type": "object",
+              "properties": {
+                "id": { "type": "string", "format": "uuid" },
+                "email": { "type": "string", "format": "email" }
+              }
+            }
+          }
+        }
+      ]
+    },
+    "tests": [
+      {
+        "description": "Compiles successfully when unique index matches lookup_fields",
+        "action": "compile",
+        "expect": {
+          "success": true,
+          "schemas": {
+            "user": {},
+            "user.filter": {}
+          }
+        }
+      }
+    ]
   }
 ]

fixtures/dependencies.json

@@ -227,8 +227,8 @@
             {
               "code": "DEPENDENCY_MISSING",
               "values": {
-                "required_property": "bar",
-                "property_name": "quux"
+                "property_name": "quux",
+                "required_property": "bar"
               },
               "details": {
                 "path": "",
@@ -386,8 +386,8 @@
             {
               "code": "DEPENDENCY_MISSING",
               "values": {
-                "required_property": "foo'bar",
-                "property_name": "foo\"bar"
+                "property_name": "foo\"bar",
+                "required_property": "foo'bar"
               },
               "details": {
                 "path": "",
@@ -829,8 +829,8 @@
             {
               "code": "MIN_PROPERTIES_VIOLATED",
               "values": {
-                "limit": "4",
-                "count": "2"
+                "count": "2",
+                "limit": "4"
               },
               "details": {
                 "path": "",

fixtures/exclusiveMaximum.json

@@ -34,8 +34,8 @@
             {
               "code": "EXCLUSIVE_MAXIMUM_VIOLATED",
               "values": {
-                "limit": "3",
-                "value": "3"
+                "value": "3",
+                "limit": "3"
               },
               "details": {
                 "path": "",

fixtures/exclusiveMinimum.json

@@ -34,8 +34,8 @@
             {
               "code": "EXCLUSIVE_MINIMUM_VIOLATED",
               "values": {
-                "limit": "1.1",
-                "value": "1.1"
+                "value": "1.1",
+                "limit": "1.1"
               },
               "details": {
                 "path": "",

fixtures/filter.json

@@ -211,13 +211,6 @@
             "gender": {},
             "gender.condition": {
               "type": "condition",
-              "compiledPropertyNames": [
-                "kind",
-                "$eq",
-                "$ne",
-                "$of",
-                "$nof"
-              ],
               "properties": {
                 "$eq": {
                   "type": [
@@ -231,15 +224,6 @@
                     "null"
                   ]
                 },
-                "$nof": {
-                  "type": [
-                    "array",
-                    "null"
-                  ],
-                  "items": {
-                    "type": "gender"
-                  }
-                },
                 "$of": {
                   "type": [
                     "array",
@@ -248,80 +232,32 @@
                   "items": {
                     "type": "gender"
                   }
+                },
+                "$nof": {
+                  "type": [
+                    "array",
+                    "null"
+                  ],
+                  "items": {
+                    "type": "gender"
+                  }
                 }
-              }
+              },
+              "compiledPropertyNames": [
+                "kind",
+                "$eq",
+                "$ne",
+                "$of",
+                "$nof"
+              ]
             },
             "person": {},
             "person.filter": {
-              "compiledPropertyNames": [
-                "first_name",
-                "age",
-                "billing_address",
-                "gender",
-                "birth_date",
-                "uuid_field",
-                "tags",
-                "ad_hoc",
-                "$and",
-                "$or"
-              ],
+              "type": "filter",
               "properties": {
-                "$and": {
-                  "items": {
-                    "compiledPropertyNames": [
-                      "first_name",
-                      "age",
-                      "billing_address",
-                      "gender",
-                      "birth_date",
-                      "uuid_field",
-                      "tags",
-                      "ad_hoc",
-                      "$and",
-                      "$or"
-                    ],
-                    "type": "person.filter"
-                  },
+                "first_name": {
                   "type": [
-                    "array",
-                    "null"
-                  ]
-                },
-                "$or": {
-                  "items": {
-                    "compiledPropertyNames": [
-                      "first_name",
-                      "age",
-                      "billing_address",
-                      "gender",
-                      "birth_date",
-                      "uuid_field",
-                      "tags",
-                      "ad_hoc",
-                      "$and",
-                      "$or"
-                    ],
-                    "type": "person.filter"
-                  },
-                  "type": [
-                    "array",
-                    "null"
-                  ]
-                },
-                "ad_hoc": {
-                  "compiledPropertyNames": [
-                    "foo"
-                  ],
-                  "properties": {
-                    "foo": {
-                      "type": [
-                        "string.condition",
-                        "null"
-                      ]
-                    }
-                  },
-                  "type": [
-                    "filter",
+                    "string.condition",
                     "null"
                   ]
                 },
@@ -337,6 +273,12 @@
                     "null"
                   ]
                 },
+                "gender": {
+                  "type": [
+                    "gender.condition",
+                    "null"
+                  ]
+                },
                 "birth_date": {
                   "type": [
                     "date.condition",
@@ -349,48 +291,48 @@
                     "null"
                   ]
                 },
-                "first_name": {
-                  "type": [
-                    "string.condition",
-                    "null"
-                  ]
-                },
-                "gender": {
-                  "type": [
-                    "gender.condition",
-                    "null"
-                  ]
-                },
                 "tags": {
                   "type": [
                     "string.condition",
                     "null"
                   ]
-                }
-              },
-              "type": "filter"
-            },
-            "address": {},
-            "address.filter": {
-              "type": "filter",
-              "compiledPropertyNames": [
-                "city",
-                "$and",
-                "$or"
-              ],
-              "properties": {
+                },
+                "ad_hoc": {
+                  "type": [
+                    "filter",
+                    "null"
+                  ],
+                  "properties": {
+                    "foo": {
+                      "type": [
+                        "string.condition",
+                        "null"
+                      ]
+                    }
+                  },
+                  "compiledPropertyNames": [
+                    "foo"
+                  ]
+                },
                 "$and": {
                   "type": [
                     "array",
                     "null"
                   ],
                   "items": {
+                    "type": "person.filter",
                     "compiledPropertyNames": [
-                      "city",
+                      "first_name",
+                      "age",
+                      "billing_address",
+                      "gender",
+                      "birth_date",
+                      "uuid_field",
+                      "tags",
+                      "ad_hoc",
                       "$and",
                       "$or"
-                    ],
-                    "type": "address.filter"
+                    ]
                   }
                 },
                 "$or": {
@@ -399,21 +341,79 @@
                     "null"
                   ],
                   "items": {
+                    "type": "person.filter",
                     "compiledPropertyNames": [
-                      "city",
+                      "first_name",
+                      "age",
+                      "billing_address",
+                      "gender",
+                      "birth_date",
+                      "uuid_field",
+                      "tags",
+                      "ad_hoc",
                       "$and",
                       "$or"
-                    ],
-                    "type": "address.filter"
+                    ]
                   }
-                },
+                }
+              },
+              "compiledPropertyNames": [
+                "first_name",
+                "age",
+                "billing_address",
+                "gender",
+                "birth_date",
+                "uuid_field",
+                "tags",
+                "ad_hoc",
+                "$and",
+                "$or"
+              ]
+            },
+            "address": {},
+            "address.filter": {
+              "type": "filter",
+              "properties": {
                 "city": {
                   "type": [
                     "string.condition",
                     "null"
                   ]
+                },
+                "$and": {
+                  "type": [
+                    "array",
+                    "null"
+                  ],
+                  "items": {
+                    "type": "address.filter",
+                    "compiledPropertyNames": [
+                      "city",
+                      "$and",
+                      "$or"
+                    ]
+                  }
+                },
+                "$or": {
+                  "type": [
+                    "array",
+                    "null"
+                  ],
+                  "items": {
+                    "type": "address.filter",
+                    "compiledPropertyNames": [
+                      "city",
+                      "$and",
+                      "$or"
+                    ]
+                  }
                 }
-              }
+              },
+              "compiledPropertyNames": [
+                "city",
+                "$and",
+                "$or"
+              ]
             },
             "condition": {},
             "filter": {},
@@ -424,52 +424,7 @@
             "search": {},
             "search.filter": {
               "type": "filter",
-              "compiledPropertyNames": [
-                "kind",
-                "name",
-                "filter",
-                "$and",
-                "$or"
-              ],
               "properties": {
-                "$and": {
-                  "type": [
-                    "array",
-                    "null"
-                  ],
-                  "items": {
-                    "compiledPropertyNames": [
-                      "kind",
-                      "name",
-                      "filter",
-                      "$and",
-                      "$or"
-                    ],
-                    "type": "search.filter"
-                  }
-                },
-                "$or": {
-                  "type": [
-                    "array",
-                    "null"
-                  ],
-                  "items": {
-                    "compiledPropertyNames": [
-                      "kind",
-                      "name",
-                      "filter",
-                      "$and",
-                      "$or"
-                    ],
-                    "type": "search.filter"
-                  }
-                },
-                "filter": {
-                  "type": [
-                    "$kind.filter",
-                    "null"
-                  ]
-                },
                 "kind": {
                   "type": [
                     "string.condition",
@@ -481,8 +436,53 @@
                     "string.condition",
                     "null"
                   ]
+                },
+                "filter": {
+                  "type": [
+                    "$kind.filter",
+                    "null"
+                  ]
+                },
+                "$and": {
+                  "type": [
+                    "array",
+                    "null"
+                  ],
+                  "items": {
+                    "type": "search.filter",
+                    "compiledPropertyNames": [
+                      "kind",
+                      "name",
+                      "filter",
+                      "$and",
+                      "$or"
+                    ]
+                  }
+                },
+                "$or": {
+                  "type": [
+                    "array",
+                    "null"
+                  ],
+                  "items": {
+                    "type": "search.filter",
+                    "compiledPropertyNames": [
+                      "kind",
+                      "name",
+                      "filter",
+                      "$and",
+                      "$or"
+                    ]
+                  }
                 }
-              }
+              },
+              "compiledPropertyNames": [
+                "kind",
+                "name",
+                "filter",
+                "$and",
+                "$or"
+              ]
             }
           }
         }

fixtures/maxContains.json

@@ -106,8 +106,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "2"
+                "count": "2",
+                "limit": "1"
               },
               "details": {
                 "path": "",
@@ -144,8 +144,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "2"
+                "count": "2",
+                "limit": "1"
               },
               "details": {
                 "path": "",
@@ -284,8 +284,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "3",
-                "count": "4"
+                "count": "4",
+                "limit": "3"
               },
               "details": {
                 "path": "",

fixtures/maxItems.json

@@ -52,8 +52,8 @@
             {
               "code": "MAX_ITEMS_VIOLATED",
               "values": {
-                "limit": "2",
-                "count": "3"
+                "count": "3",
+                "limit": "2"
               },
               "details": {
                 "path": "",

fixtures/maxLength.json

@@ -43,8 +43,8 @@
             {
               "code": "MAX_LENGTH_VIOLATED",
               "values": {
-                "limit": "2",
-                "count": "3"
+                "count": "3",
+                "limit": "2"
               },
               "details": {
                 "path": "",
@@ -109,8 +109,8 @@
             {
               "code": "MAX_LENGTH_VIOLATED",
               "values": {
-                "limit": "2",
-                "count": "3"
+                "count": "3",
+                "limit": "2"
               },
               "details": {
                 "path": "",

fixtures/maxProperties.json

@@ -139,8 +139,8 @@
             {
               "code": "MAX_PROPERTIES_VIOLATED",
               "values": {
-                "limit": "2",
-                "count": "3"
+                "count": "3",
+                "limit": "2"
               },
               "details": {
                 "path": "",
@@ -190,8 +190,8 @@
             {
               "code": "MAX_PROPERTIES_VIOLATED",
               "values": {
-                "limit": "0",
-                "count": "1"
+                "count": "1",
+                "limit": "0"
               },
               "details": {
                 "path": "",

fixtures/maximum.json

@@ -118,8 +118,8 @@
             {
               "code": "MAXIMUM_VIOLATED",
               "values": {
-                "limit": "300",
-                "value": "300.5"
+                "value": "300.5",
+                "limit": "300"
               },
               "details": {
                 "path": "",

fixtures/merge.json

@@ -239,8 +239,8 @@
             {
               "code": "DEPENDENCY_MISSING",
               "values": {
-                "required_property": "base_dep",
-                "property_name": "trigger"
+                "property_name": "trigger",
+                "required_property": "base_dep"
               },
               "details": {
                 "path": "",

fixtures/merger.json

@@ -117,6 +117,16 @@
           ]
         }
       ],
+      "indexes": [
+        {
+          "table": "person",
+          "columns": ["first_name", "last_name", "date_of_birth", "pronouns"]
+        },
+        {
+          "table": "user",
+          "columns": ["name"]
+        }
+      ],
       "types": [
         {
           "name": "entity",
@@ -296,7 +306,9 @@
               "archived"
             ]
           },
-          "lookup_fields": [],
+          "lookup_fields": [
+            "name"
+          ],
           "historical": true,
           "notify": true,
           "relationship": false
@@ -478,9 +490,7 @@
               "organization_id"
             ]
           },
-          "lookup_fields": [
-            "id"
-          ],
+          "lookup_fields": [],
           "historical": true,
           "notify": true,
           "relationship": false
@@ -1068,9 +1078,7 @@
               "archived"
             ]
           },
-          "lookup_fields": [
-            "id"
-          ],
+          "lookup_fields": [],
           "historical": true,
           "relationship": false,
           "field_types": {
@@ -1593,6 +1601,180 @@
           ]
         }
       },
+      {
+        "description": "Update existing person with id and multiple inherited lookup keys",
+        "action": "merge",
+        "data": {
+          "id": "33333333-3333-3333-3333-333333333333",
+          "type": "person",
+          "name": "LookupName",
+          "first_name": "LookupFirst",
+          "last_name": "LookupLast",
+          "date_of_birth": "1990-01-01T00:00:00Z",
+          "pronouns": "they/them",
+          "contact_id": "abc-contact"
+        },
+        "mocks": [
+          {
+            "id": "22222222-2222-2222-2222-222222222222",
+            "type": "person",
+            "name": "LookupName",
+            "first_name": "LookupFirst",
+            "last_name": "LookupLast",
+            "date_of_birth": "1990-01-01T00:00:00Z",
+            "pronouns": "they/them",
+            "contact_id": "old-contact"
+          }
+        ],
+        "schema_id": "person",
+        "expect": {
+          "success": true,
+          "sql": [
+            [
+              "(SELECT to_jsonb(t1.*) || to_jsonb(t2.*) || to_jsonb(t3.*) || to_jsonb(t4.*)",
+              "FROM agreego.\"entity\" t1",
+              "LEFT JOIN agreego.\"organization\" t2 ON t2.id = t1.id",
+              "LEFT JOIN agreego.\"user\" t3 ON t3.id = t1.id",
+              "LEFT JOIN agreego.\"person\" t4 ON t4.id = t1.id",
+              "WHERE",
+              "  t1.id = '{{uuid:data.id}}'",
+              "UNION SELECT to_jsonb(t1.*) || to_jsonb(t2.*) || to_jsonb(t3.*) || to_jsonb(t4.*)",
+              "FROM agreego.\"entity\" t1",
+              "LEFT JOIN agreego.\"organization\" t2 ON t2.id = t1.id",
+              "LEFT JOIN agreego.\"user\" t3 ON t3.id = t1.id",
+              "LEFT JOIN agreego.\"person\" t4 ON t4.id = t1.id",
+              "WHERE",
+              "  (\"first_name\" = 'LookupFirst'",
+              "  AND \"last_name\" = 'LookupLast'",
+              "  AND \"date_of_birth\" = '{{timestamp}}'",
+              "  AND \"pronouns\" = 'they/them')",
+              "UNION SELECT to_jsonb(t1.*) || to_jsonb(t2.*) || to_jsonb(t3.*) || to_jsonb(t4.*)",
+              "FROM agreego.\"entity\" t1",
+              "LEFT JOIN agreego.\"organization\" t2 ON t2.id = t1.id",
+              "LEFT JOIN agreego.\"user\" t3 ON t3.id = t1.id",
+              "LEFT JOIN agreego.\"person\" t4 ON t4.id = t1.id",
+              "WHERE",
+              "  (\"name\" = 'LookupName'))"
+            ],
+            [
+              "INSERT INTO agreego.\"entity\" (",
+              "  \"created_at\",",
+              "  \"created_by\",",
+              "  \"id\",",
+              "  \"modified_at\",",
+              "  \"modified_by\",",
+              "  \"type\"",
+              ")",
+              "VALUES (",
+              "  '{{timestamp}}',",
+              "  '00000000-0000-0000-0000-000000000000',",
+              "  '{{uuid:data.id}}',",
+              "  '{{timestamp}}',",
+              "  '00000000-0000-0000-0000-000000000000',",
+              "  'person'",
+              ")"
+            ],
+            [
+              "INSERT INTO agreego.\"organization\" (",
+              "  \"id\",",
+              "  \"name\",",
+              "  \"type\"",
+              ")",
+              "VALUES (",
+              "  '{{uuid:data.id}}',",
+              "  'LookupName',",
+              "  'person'",
+              ")"
+            ],
+            [
+              "INSERT INTO agreego.\"user\" (",
+              "  \"id\",",
+              "  \"type\"",
+              ")",
+              "VALUES (",
+              "  '{{uuid:data.id}}',",
+              "  'person'",
+              ")"
+            ],
+            [
+              "INSERT INTO agreego.\"person\" (",
+              "  \"contact_id\",",
+              "  \"date_of_birth\",",
+              "  \"first_name\",",
+              "  \"id\",",
+              "  \"last_name\",",
+              "  \"pronouns\",",
+              "  \"type\"",
+              ")",
+              "VALUES (",
+              "  'abc-contact',",
+              "  '{{timestamp}}',",
+              "  'LookupFirst',",
+              "  '{{uuid:data.id}}',",
+              "  'LookupLast',",
+              "  'they/them',",
+              "  'person'",
+              ")"
+            ],
+            [
+              "INSERT INTO agreego.change (",
+              "  \"old\",",
+              "  \"new\",",
+              "  \"entity_id\",",
+              "  \"id\",",
+              "  \"kind\",",
+              "  \"modified_at\",",
+              "  \"modified_by\"",
+              ")",
+              "VALUES (",
+              "  NULL,",
+              "  '{",
+              "      \"name\": \"LookupName\",",
+              "      \"first_name\": \"LookupFirst\",",
+              "      \"last_name\": \"LookupLast\",",
+              "      \"date_of_birth\": \"{{timestamp}}\",",
+              "      \"pronouns\": \"they/them\",",
+              "      \"contact_id\": \"abc-contact\",",
+              "      \"type\": \"person\"",
+              "  }',",
+              "  '{{uuid:data.id}}',",
+              "  '{{uuid:generated_0}}',",
+              "  'create',",
+              "  '{{timestamp}}',",
+              "  '00000000-0000-0000-0000-000000000000'",
+              ")"
+            ],
+            [
+              "(SELECT pg_notify('entity', '{",
+              "    \"kind\": \"create\",",
+              "    \"complete\": {",
+              "      \"name\": \"LookupName\",",
+              "      \"first_name\": \"LookupFirst\",",
+              "      \"last_name\": \"LookupLast\",",
+              "      \"date_of_birth\": \"{{timestamp}}\",",
+              "      \"pronouns\": \"they/them\",",
+              "      \"contact_id\": \"abc-contact\",",
+              "      \"id\": \"{{uuid:data.id}}\",",
+              "      \"type\": \"person\",",
+              "      \"created_by\": \"00000000-0000-0000-0000-000000000000\",",
+              "      \"created_at\": \"{{timestamp}}\",",
+              "      \"modified_by\": \"00000000-0000-0000-0000-000000000000\",",
+              "      \"modified_at\": \"{{timestamp}}\"",
+              "    },",
+              "    \"new\": {",
+              "      \"name\": \"LookupName\",",
+              "      \"first_name\": \"LookupFirst\",",
+              "      \"last_name\": \"LookupLast\",",
+              "      \"date_of_birth\": \"{{timestamp}}\",",
+              "      \"pronouns\": \"they/them\",",
+              "      \"contact_id\": \"abc-contact\",",
+              "      \"type\": \"person\"",
+              "    }",
+              "}'))"
+            ]
+          ]
+        }
+      },
       {
         "description": "Replace existing person with id and no changes (lookup)",
         "action": "merge",
@@ -2235,12 +2417,7 @@
               "FROM agreego.\"entity\" t1",
               "LEFT JOIN agreego.\"order\" t2 ON t2.id = t1.id",
               "WHERE",
-              "  t1.id = 'abc'",
-              "UNION SELECT to_jsonb(t1.*) || to_jsonb(t2.*)",
-              "FROM agreego.\"entity\" t1",
-              "LEFT JOIN agreego.\"order\" t2 ON t2.id = t1.id",
-              "WHERE",
-              "  (\"id\" = 'abc'))"
+              "  t1.id = 'abc')"
             ],
             [
               "INSERT INTO agreego.\"entity\" (",
@@ -3519,12 +3696,7 @@
               "FROM agreego.\"entity\" t1",
               "LEFT JOIN agreego.\"invoice\" t2 ON t2.id = t1.id",
               "WHERE",
-              "  t1.id = '{{uuid:data.id}}'",
-              "UNION SELECT to_jsonb(t1.*) || to_jsonb(t2.*)",
-              "FROM agreego.\"entity\" t1",
-              "LEFT JOIN agreego.\"invoice\" t2 ON t2.id = t1.id",
-              "WHERE",
-              "  (\"id\" = '{{uuid:data.id}}'))"
+              "  t1.id = '{{uuid:data.id}}')"
             ],
             [
               "INSERT INTO agreego.\"entity\" (",

fixtures/minContains.json

@@ -169,8 +169,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "2",
-                "count": "0"
+                "count": "0",
+                "limit": "2"
               },
               "details": {
                 "path": "",
@@ -357,8 +357,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "2",
-                "count": "0"
+                "count": "0",
+                "limit": "2"
               },
               "details": {
                 "path": "",
@@ -463,8 +463,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "3",
-                "count": "0"
+                "count": "0",
+                "limit": "3"
               },
               "details": {
                 "path": "",
@@ -487,8 +487,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "3",
-                "count": "1"
+                "count": "1",
+                "limit": "3"
               },
               "details": {
                 "path": "",
@@ -513,8 +513,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "3"
+                "count": "3",
+                "limit": "1"
               },
               "details": {
                 "path": "",
@@ -657,8 +657,8 @@
             {
               "code": "CONTAINS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "2"
+                "count": "2",
+                "limit": "1"
               },
               "details": {
                 "path": "",

fixtures/minItems.json

@@ -108,8 +108,8 @@
             {
               "code": "MIN_ITEMS_VIOLATED",
               "values": {
-                "limit": "1",
-                "count": "0"
+                "count": "0",
+                "limit": "1"
               },
               "details": {
                 "path": "",

fixtures/minLength.json

@@ -43,8 +43,8 @@
             {
               "code": "MIN_LENGTH_VIOLATED",
               "values": {
-                "limit": "2",
-                "count": "1"
+                "count": "1",
+                "limit": "2"
               },
               "details": {
                 "path": "",

fixtures/minimum.json

@@ -43,8 +43,8 @@
             {
               "code": "MINIMUM_VIOLATED",
               "values": {
-                "limit": "1.1",
-                "value": "0.6"
+                "value": "0.6",
+                "limit": "1.1"
               },
               "details": {
                 "path": "",
@@ -127,8 +127,8 @@
             {
               "code": "MINIMUM_VIOLATED",
               "values": {
-                "limit": "-2",
-                "value": "-2.0001"
+                "value": "-2.0001",
+                "limit": "-2"
               },
               "details": {
                 "path": "",
@@ -149,8 +149,8 @@
             {
               "code": "MINIMUM_VIOLATED",
               "values": {
-                "limit": "-2",
-                "value": "-3"
+                "value": "-3",
+                "limit": "-2"
               },
               "details": {
                 "path": "",

fixtures/multipleOf.json

@@ -148,8 +148,8 @@
             {
               "code": "MULTIPLE_OF_VIOLATED",
               "values": {
-                "multiple_of": "0.0001",
-                "value": "0.00751"
+                "value": "0.00751",
+                "multiple_of": "0.0001"
               },
               "details": {
                 "path": "",

fixtures/objectTypes.json

@@ -156,8 +156,8 @@
             {
               "code": "MAXIMUM_VIOLATED",
               "values": {
-                "limit": "50",
-                "value": "60"
+                "value": "60",
+                "limit": "50"
               },
               "details": {
                 "path": "max",

fixtures/paths.json

@@ -200,8 +200,8 @@
             {
               "code": "MINIMUM_VIOLATED",
               "values": {
-                "limit": "10",
-                "value": "5"
+                "value": "5",
+                "limit": "10"
               },
               "details": {
                 "path": "entities/entity-beta/value",

fixtures/pattern.json

@@ -34,8 +34,8 @@
             {
               "code": "PATTERN_VIOLATED",
               "values": {
-                "value": "abc",
-                "pattern": "^a*$"
+                "pattern": "^a*$",
+                "value": "abc"
               },
               "details": {
                 "path": "",

fixtures/polymorphism.json

@@ -148,8 +148,8 @@
             {
               "code": "NO_FAMILY_MATCH",
               "values": {
-                "value": "alien",
-                "discriminator": "type"
+                "discriminator": "type",
+                "value": "alien"
               },
               "details": {
                 "path": "",
@@ -284,8 +284,8 @@
             {
               "code": "NO_FAMILY_MATCH",
               "values": {
-                "value": "bot",
-                "discriminator": "type"
+                "discriminator": "type",
+                "value": "bot"
               },
               "details": {
                 "path": "",
@@ -591,8 +591,8 @@
             {
               "code": "NO_ONEOF_MATCH",
               "values": {
-                "value": "alien",
-                "discriminator": "type"
+                "discriminator": "type",
+                "value": "alien"
               },
               "details": {
                 "path": "",
@@ -931,8 +931,8 @@
             {
               "code": "NO_FAMILY_MATCH",
               "values": {
-                "value": "unknown_panel",
-                "discriminator": "kind"
+                "discriminator": "kind",
+                "value": "unknown_panel"
               },
               "details": {
                 "path": "",

fixtures/propertyNames.json

@@ -431,8 +431,8 @@
             {
               "code": "MAX_LENGTH_VIOLATED",
               "values": {
-                "limit": "3",
-                "count": "6"
+                "count": "6",
+                "limit": "3"
               },
               "details": {
                 "path": "",

fixtures/queryer.json

@@ -258,9 +258,7 @@
             "name": "text",
             "created_at": "timestamptz"
           },
-          "lookup_fields": [
-            "id"
-          ],
+          "lookup_fields": [],
           "null_fields": [],
           "default_fields": [
             "id",
@@ -806,9 +804,7 @@
               "archived"
             ]
           },
-          "lookup_fields": [
-            "id"
-          ],
+          "lookup_fields": [],
           "historical": true,
           "relationship": false,
           "field_types": {
@@ -1106,9 +1102,7 @@
               "archived"
             ]
           },
-          "lookup_fields": [
-            "id"
-          ],
+          "lookup_fields": [],
           "historical": true,
           "relationship": false,
           "field_types": {
@@ -2461,11 +2455,13 @@
           "constraint": "fk_attachment_attachable_entity",
           "source_type": "attachment",
           "source_columns": [
-            "attachable_id"
+            "attachable_id",
+            "attachable_type"
           ],
           "destination_type": "entity",
           "destination_columns": [
-            "id"
+            "id",
+            "type"
           ],
           "prefix": "attachable"
         }
@@ -2669,6 +2665,7 @@
               "        NOT entity_3.archived",
               "        AND attachment_4.kind = 'cover'",
               "        AND attachment_4.attachable_id = entity_1.id",
+              "      LIMIT 1",
               "    ),",
               "    'cover_attachments', (",
               "      SELECT COALESCE(jsonb_agg(jsonb_build_object(",

fixtures/traits.json

@@ -139,8 +139,8 @@
             {
               "code": "MAX_LENGTH_VIOLATED",
               "values": {
-                "limit": "5",
-                "count": "26"
+                "count": "26",
+                "limit": "5"
               },
               "details": {
                 "path": "email",

src/database/compile/collection.rs

@@ -2,7 +2,7 @@ use crate::database::schema::Schema;
 #[allow(unused_imports)]
 use crate::drop::{Error, ErrorDetails};
 #[allow(unused_imports)]
-use std::collections::HashMap;
+use indexmap::IndexMap;
 use std::sync::Arc;
 
 impl Schema {
@@ -19,7 +19,7 @@ impl Schema {
       if !c.is_ascii_lowercase() && !c.is_ascii_digit() && c != '_' && c != '.' && c != '$' {
         errors.push(Error {
           code: "INVALID_IDENTIFIER".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("character".to_string(), c.to_string()),
             ("field_name".to_string(), field_name.to_string()),
             ("identifier".to_string(), id.to_string()),

src/database/compile/mod.rs

@@ -7,7 +7,6 @@ pub mod polymorphism;
 use crate::database::schema::Schema;
 use crate::drop::{Error, ErrorDetails};
 use indexmap::IndexMap;
-use std::collections::HashMap;
 
 impl Schema {
   pub fn compile(
@@ -64,7 +63,7 @@ impl Schema {
       if custom_type_count > 1 {
         errors.push(Error {
           code: "MULTIPLE_INHERITANCE_PROHIBITED".to_string(),
-          values: Some(HashMap::from([("types".to_string(), types.join(", "))])),
+          values: Some(IndexMap::from([("types".to_string(), types.join(", "))])),
           details: ErrorDetails {
             path: Some(path.clone()),
             schema: Some(root_id.to_string()),

src/database/compile/polymorphism.rs

@@ -1,6 +1,6 @@
 use crate::drop::{Error, ErrorDetails};
 use indexmap::IndexSet;
-use std::collections::HashMap;
+use indexmap::IndexMap;
 use crate::database::schema::Schema;
 
 impl Schema {
@@ -144,7 +144,7 @@ impl Schema {
             if options.contains_key(&val) {
               errors.push(Error {
                   code: "POLYMORPHIC_COLLISION".to_string(),
-                  values: Some(HashMap::from([("value".to_string(), val.to_string())])),
+                  values: Some(IndexMap::from([("value".to_string(), val.to_string())])),
                   details: ErrorDetails {
                      path: Some(path.to_string()),
                      schema: Some(root_id.to_string()),

src/database/compose/mod.rs

@@ -1,6 +1,7 @@
 use crate::drop::{Error, ErrorDetails};
 use serde_json::Value;
 use std::collections::{HashMap, HashSet};
+use indexmap::IndexMap;
 
 pub fn compose(val: &mut Value, errors: &mut Vec<Error>) {
   let mut traits = HashMap::new();
@@ -114,7 +115,7 @@ fn resolve_in_place(
           if visited.contains(inc_name) {
             errors.push(Error {
               code: "CIRCULAR_INCLUDE_DETECTED".to_string(),
-              values: Some(HashMap::from([(
+              values: Some(IndexMap::from([(
                 "include".to_string(),
                 inc_name.to_string(),
               )])),
@@ -218,7 +219,7 @@ fn resolve_in_place(
           } else {
             errors.push(Error {
               code: "TRAIT_NOT_FOUND".to_string(),
-              values: Some(HashMap::from([(
+              values: Some(IndexMap::from([(
                 "include".to_string(),
                 inc_name.to_string(),
               )])),

src/database/executors/mock.rs

@@ -85,6 +85,10 @@ impl DatabaseExecutor for MockExecutor {
     Ok("2026-03-10T00:00:00Z".to_string())
   }
 
+  fn is_mock(&self) -> bool {
+    true
+  }
+
   #[cfg(test)]
   fn get_queries(&self) -> Vec<String> {
     MOCK_STATE.with(|state| state.borrow().captured_queries.clone())

src/database/executors/mod.rs

@@ -20,6 +20,11 @@ pub trait DatabaseExecutor: Send + Sync {
   /// Returns the current transaction timestamp
   fn timestamp(&self) -> Result<String, String>;
 
+  /// Returns whether this is a mock executor (bypassing pg_catalog index checks)
+  fn is_mock(&self) -> bool {
+    false
+  }
+
   #[cfg(test)]
   fn get_queries(&self) -> Vec<String>;
 

src/database/mod.rs

@@ -21,16 +21,22 @@ use executors::pgrx::SpiExecutor;
 #[cfg(test)]
 use executors::mock::MockExecutor;
 
+use indexmap::IndexMap;
 use punc::Punc;
 use relation::Relation;
 use schema::Schema;
 use serde_json::Value;
-use indexmap::IndexMap;
 use std::sync::Arc;
 use r#type::Type;
-use std::collections::HashMap;
+
 use crate::drop::{Drop, Error, ErrorDetails};
 
+#[derive(serde::Serialize, serde::Deserialize, Debug, Clone)]
+pub struct IndexInfo {
+  pub table: String,
+  pub columns: Vec<String>,
+}
+
 #[derive(serde::Serialize)]
 pub struct Database {
   pub enums: IndexMap<String, Enum>,
@@ -38,6 +44,8 @@ pub struct Database {
   pub puncs: IndexMap<String, Punc>,
   pub relations: IndexMap<String, Relation>,
   #[serde(skip)]
+  pub indexes: Vec<IndexInfo>,
+  #[serde(skip)]
   pub schemas: IndexMap<String, Arc<Schema>>,
   #[serde(skip)]
   pub executor: Box<dyn DatabaseExecutor + Send + Sync>,
@@ -50,6 +58,7 @@ impl Database {
       types: IndexMap::new(),
       relations: IndexMap::new(),
       puncs: IndexMap::new(),
+      indexes: Vec::new(),
       schemas: IndexMap::new(),
       #[cfg(not(test))]
       executor: Box::new(SpiExecutor::new()),
@@ -76,7 +85,7 @@ impl Database {
             Err(e) => {
               errors.push(Error {
                 code: "DATABASE_ENUM_PARSE_FAILED".to_string(),
-                values: Some(HashMap::from([
+                values: Some(IndexMap::from([
                   ("enum".to_string(), name.clone()),
                   ("reason".to_string(), e.to_string()),
                 ])),
@@ -104,7 +113,7 @@ impl Database {
             Err(e) => {
               errors.push(Error {
                 code: "DATABASE_TYPE_PARSE_FAILED".to_string(),
-                values: Some(HashMap::from([
+                values: Some(IndexMap::from([
                   ("type".to_string(), name.clone()),
                   ("reason".to_string(), e.to_string()),
                 ])),
@@ -136,7 +145,7 @@ impl Database {
             Err(e) => {
               errors.push(Error {
                 code: "DATABASE_RELATION_PARSE_FAILED".to_string(),
-                values: Some(HashMap::from([
+                values: Some(IndexMap::from([
                   ("relation".to_string(), constraint.clone()),
                   ("reason".to_string(), e.to_string()),
                 ])),
@@ -164,7 +173,7 @@ impl Database {
             Err(e) => {
               errors.push(Error {
                 code: "DATABASE_PUNC_PARSE_FAILED".to_string(),
-                values: Some(HashMap::from([
+                values: Some(IndexMap::from([
                   ("punc".to_string(), name.clone()),
                   ("reason".to_string(), e.to_string()),
                 ])),
@@ -177,6 +186,25 @@ impl Database {
           }
         }
       }
+
+      if let Some(serde_json::Value::Array(arr)) = map.remove("indexes") {
+        for item in arr {
+          match serde_json::from_value::<IndexInfo>(item) {
+            Ok(idx) => {
+              db.indexes.push(idx);
+            }
+            Err(e) => {
+              errors.push(Error {
+                code: "DATABASE_INDEX_PARSE_FAILED".to_string(),
+                values: Some(IndexMap::from([("reason".to_string(), e.to_string())])),
+                details: ErrorDetails {
+                  ..Default::default()
+                },
+              });
+            }
+          }
+        }
+      }
     }
 
     db.compile(&mut errors);
@@ -214,7 +242,6 @@ impl Database {
     self.executor.timestamp()
   }
 
-
   pub fn compile(&mut self, errors: &mut Vec<crate::drop::Error>) {
     // Phase 1: Registration
     self.collect_schemas(errors);
@@ -260,6 +287,43 @@ impl Database {
           .compile(self, root_id, id.clone(), errors);
       }
     }
+
+    // Phase 5: Verify unique indexes for defined lookup fields
+    for (_, type_def) in &self.types {
+      if !type_def.lookup_fields.is_empty() {
+        let mut index_found = false;
+        for index in &self.indexes {
+          if index.table == type_def.name {
+            if index.columns.len() == type_def.lookup_fields.len()
+              && index
+                .columns
+                .iter()
+                .all(|c| type_def.lookup_fields.contains(c))
+            {
+              index_found = true;
+              break;
+            }
+          }
+        }
+        if !index_found {
+          errors.push(Error {
+            code: "MISSING_LOOKUP_INDEX".to_string(),
+            values: Some(IndexMap::from([
+              ("type".to_string(), type_def.name.clone()),
+              (
+                "lookup_fields".to_string(),
+                format!("{:?}", type_def.lookup_fields),
+              ),
+            ])),
+            details: ErrorDetails {
+              path: Some(format!("/types/{}", type_def.name)),
+              schema: Some(type_def.name.clone()),
+              ..Default::default()
+            },
+          });
+        }
+      }
+    }
   }
 
   /// Synthesizes Composed Filter References for all table-backed boundaries.
@@ -395,7 +459,6 @@ impl Database {
     }
   }
 
-
   /// Inspects the Postgres pg_constraint relations catalog to securely identify
   /// the precise Foreign Key connecting a parent and child hierarchy path.
   pub fn resolve_relation<'a>(
@@ -461,7 +524,7 @@ impl Database {
 
       errors.push(Error {
         code: "EDGE_MISSING".to_string(),
-        values: Some(HashMap::from([
+        values: Some(IndexMap::from([
           ("parent_type".to_string(), parent_type.to_string()),
           ("child_type".to_string(), child_type.to_string()),
           ("property_name".to_string(), prop_name.to_string()),
@@ -563,7 +626,7 @@ impl Database {
 
       errors.push(Error {
         code: "AMBIGUOUS_TYPE_RELATIONS".to_string(),
-        values: Some(HashMap::from([
+        values: Some(IndexMap::from([
           ("parent_type".to_string(), parent_type.to_string()),
           ("child_type".to_string(), child_type.to_string()),
           ("property_name".to_string(), prop_name.to_string()),

src/drop.rs

@@ -57,13 +57,13 @@ impl Drop {
   }
 }
 
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct Error {
   pub code: String,
   #[serde(skip_serializing_if = "Option::is_none")]
-  pub values: Option<HashMap<String, String>>,
+  pub values: Option<IndexMap<String, String>>,
   pub details: ErrorDetails,
 }
 

src/merger/mod.rs

@@ -7,7 +7,7 @@ use crate::database::Database;
 use crate::database::r#type::Type;
 use crate::drop::{Drop, Error, ErrorDetails};
 use serde_json::Value;
-use std::collections::HashMap;
+use indexmap::IndexMap;
 use std::sync::Arc;
 
 pub struct Merger {
@@ -31,7 +31,7 @@ impl Merger {
       None => {
         return Drop::with_errors(vec![Error {
           code: "SCHEMA_NOT_FOUND".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("schema".to_string(), schema_id.to_string()),
           ])),
           details: ErrorDetails {
@@ -78,7 +78,7 @@ impl Merger {
 
         return Drop::with_errors(vec![Error {
           code: final_code,
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("error".to_string(), final_message),
           ])),
           details: ErrorDetails {
@@ -96,7 +96,7 @@ impl Merger {
       if let Err(e) = self.db.execute(&notify_sql, None) {
         return Drop::with_errors(vec![Error {
           code: "MERGE_FAILED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("error".to_string(), e.to_string()),
           ])),
           details: ErrorDetails {
@@ -677,25 +677,32 @@ impl Merger {
     let id_val = entity_fields.get("id");
     let entity_type_name = entity_type.name.as_str();
 
-    let mut lookup_complete = false;
-    if !entity_type.lookup_fields.is_empty() {
-      lookup_complete = true;
-      for column in &entity_type.lookup_fields {
-        match entity_fields.get(column) {
-          Some(Value::Null) | None => {
-            lookup_complete = false;
-            break;
+    let mut lookup_satisfied_keys = Vec::new();
+    for parent_type_name in entity_type.hierarchy.iter().rev() {
+      if let Some(parent_type) = self.db.types.get(parent_type_name) {
+        if !parent_type.lookup_fields.is_empty() {
+          let mut lookup_complete = true;
+          for column in &parent_type.lookup_fields {
+            match entity_fields.get(column) {
+              Some(Value::Null) | None => {
+                lookup_complete = false;
+                break;
+              }
+              Some(Value::String(s)) if s.is_empty() => {
+                lookup_complete = false;
+                break;
+              }
+              _ => {}
+            }
           }
-          Some(Value::String(s)) if s.is_empty() => {
-            lookup_complete = false;
-            break;
+          if lookup_complete {
+            lookup_satisfied_keys.push(&parent_type.lookup_fields);
           }
-          _ => {}
         }
       }
     }
 
-    if id_val.is_none() && !lookup_complete {
+    if id_val.is_none() && lookup_satisfied_keys.is_empty() {
       return Ok(None);
     }
 
@@ -727,9 +734,9 @@ impl Merger {
       where_parts.push(format!("t1.id = {}", Self::quote_literal(id)));
     }
 
-    if lookup_complete {
+    for lookup_fields in lookup_satisfied_keys {
       let mut lookup_predicates = Vec::new();
-      for column in &entity_type.lookup_fields {
+      for column in lookup_fields {
         let val = entity_fields.get(column).unwrap_or(&Value::Null);
         if column == "type" {
           lookup_predicates.push(format!("t1.\"{}\" = {}", column, Self::quote_literal(val)));

src/queryer/compiler.rs

@@ -240,7 +240,7 @@ impl<'a> Compiler<'a> {
     };
 
     // 3. Build WHERE clauses
-    let where_clauses = self.compile_where_clause(r#type, &table_aliases, node)?;
+    let where_clauses = self.compile_where_clause(r#type, &table_aliases, node.clone())?;
 
     let selection = if is_array {
       format!("COALESCE(jsonb_agg({}), '[]'::jsonb)", jsonb_obj_sql)
@@ -248,11 +248,38 @@ impl<'a> Compiler<'a> {
       jsonb_obj_sql
     };
 
+    let mut limit_clause = "";
+    if !is_array {
+      let is_reverse = if let Some(prop_ref) = &node.property_name {
+        let prop = prop_ref.as_str();
+        if let Some(parent_schema) = &node.parent_schema {
+          if let Some(compiled_edges) = parent_schema.obj.compiled_edges.get() {
+            if let Some(edge) = compiled_edges.get(prop) {
+              !edge.forward
+            } else {
+              false
+            }
+          } else {
+            false
+          }
+        } else {
+          false
+        }
+      } else {
+        false
+      };
+
+      if is_reverse {
+        limit_clause = " LIMIT 1";
+      }
+    }
+
     let full_sql = format!(
-      "(SELECT {} FROM {} WHERE {})",
+      "(SELECT {} FROM {} WHERE {}{})",
       selection,
       from_clauses.join(" "),
-      where_clauses.join(" AND ")
+      where_clauses.join(" AND "),
+      limit_clause
     );
 
     Ok((
@@ -621,9 +648,6 @@ impl<'a> Compiler<'a> {
                   if edge.forward && relation.source_columns.len() > 1 {
                     poly_col = Some(&relation.source_columns[1]); // e.g., target_type
                     table_to_alias = &relation.source_type; // e.g., relationship
-                  } else if !edge.forward && relation.destination_columns.len() > 1 {
-                    poly_col = Some(&relation.destination_columns[1]); // e.g., source_type
-                    table_to_alias = &relation.destination_type; // e.g., relationship
                   }
 
                   if let Some(col) = poly_col {

src/queryer/mod.rs

@@ -1,6 +1,6 @@
 use crate::database::Database;
 use crate::drop::{Drop, Error, ErrorDetails};
-use std::collections::HashMap;
+use indexmap::IndexMap;
 use std::sync::Arc;
 
 pub mod compiler;
@@ -33,7 +33,7 @@ impl Queryer {
       Err(msg) => {
         return Drop::with_errors(vec![Error {
           code: "FILTER_PARSE_FAILED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("error".to_string(), msg.clone()),
           ])),
           details: ErrorDetails {
@@ -140,7 +140,7 @@ impl Queryer {
       }
       Err(e) => Err(Drop::with_errors(vec![Error {
         code: "QUERY_COMPILATION_FAILED".to_string(),
-        values: Some(HashMap::from([
+        values: Some(IndexMap::from([
           ("error".to_string(), e.clone()),
         ])),
         details: ErrorDetails {
@@ -169,7 +169,7 @@ impl Queryer {
       }
       Ok(other) => Drop::with_errors(vec![Error {
         code: "QUERY_FAILED".to_string(),
-        values: Some(HashMap::from([
+        values: Some(IndexMap::from([
           ("error".to_string(), format!("Expected array from generic query, got: {:?}", other)),
         ])),
         details: ErrorDetails {
@@ -181,7 +181,7 @@ impl Queryer {
       }]),
       Err(e) => Drop::with_errors(vec![Error {
         code: "QUERY_FAILED".to_string(),
-        values: Some(HashMap::from([
+        values: Some(IndexMap::from([
           ("error".to_string(), e.to_string()),
         ])),
         details: ErrorDetails {

src/tests/fixtures.rs

@@ -3407,6 +3407,18 @@ fn test_database_6_0() {
     crate::tests::runner::run_test_case(&path, 6, 0).unwrap();
 }
 
+#[test]
+fn test_database_7_0() {
+    let path = format!("{}/fixtures/database.json", env!("CARGO_MANIFEST_DIR"));
+    crate::tests::runner::run_test_case(&path, 7, 0).unwrap();
+}
+
+#[test]
+fn test_database_8_0() {
+    let path = format!("{}/fixtures/database.json", env!("CARGO_MANIFEST_DIR"));
+    crate::tests::runner::run_test_case(&path, 8, 0).unwrap();
+}
+
 #[test]
 fn test_cases_0_0() {
     let path = format!("{}/fixtures/cases.json", env!("CARGO_MANIFEST_DIR"));
@@ -7666,3 +7678,9 @@ fn test_merger_0_15() {
     let path = format!("{}/fixtures/merger.json", env!("CARGO_MANIFEST_DIR"));
     crate::tests::runner::run_test_case(&path, 0, 15).unwrap();
 }
+
+#[test]
+fn test_merger_0_16() {
+    let path = format!("{}/fixtures/merger.json", env!("CARGO_MANIFEST_DIR"));
+    crate::tests::runner::run_test_case(&path, 0, 16).unwrap();
+}

src/tests/formatter.rs

@@ -180,6 +180,9 @@ impl SqlFormatter {
 
     fn format_query(&mut self, query: &Query) {
         self.format_set_expr(&query.body);
+        if let Some(limit_clause) = &query.limit_clause {
+            self.push_line(&format!("{}", limit_clause.to_string().trim()));
+        }
     }
 
     fn format_set_expr(&mut self, set_expr: &SetExpr) {

src/validator/error.rs

@@ -1,9 +1,9 @@
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 #[derive(Debug, Clone, serde::Serialize)]
 pub struct ValidationError {
   pub code: String,
   #[serde(skip_serializing_if = "Option::is_none")]
-  pub values: Option<HashMap<String, String>>,
+  pub values: Option<IndexMap<String, String>>,
   pub path: String,
 }

src/validator/mod.rs

@@ -1,4 +1,5 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::HashSet;
+use indexmap::IndexMap;
 
 pub mod context;
 pub mod error;
@@ -92,7 +93,7 @@ impl Validator {
     } else {
       Drop::with_errors(vec![Error {
         code: "SCHEMA_NOT_FOUND".to_string(),
-        values: Some(HashMap::from([
+        values: Some(IndexMap::from([
           ("schema".to_string(), schema_id.to_string()),
         ])),
         details: ErrorDetails {

src/validator/rules/array.rs

@@ -1,4 +1,5 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::HashSet;
+use indexmap::IndexMap;
 
 use serde_json::Value;
 
@@ -18,7 +19,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MIN_ITEMS_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("count".to_string(), arr.len().to_string()),
             ("limit".to_string(), min.to_string()),
           ])),
@@ -30,7 +31,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MAX_ITEMS_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("count".to_string(), arr.len().to_string()),
             ("limit".to_string(), max.to_string()),
           ])),
@@ -77,7 +78,7 @@ impl<'a> ValidationContext<'a> {
         if _match_count < min {
           result.errors.push(ValidationError {
             code: "CONTAINS_VIOLATED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("count".to_string(), _match_count.to_string()),
               ("limit".to_string(), min.to_string()),
             ])),
@@ -89,7 +90,7 @@ impl<'a> ValidationContext<'a> {
         {
           result.errors.push(ValidationError {
             code: "CONTAINS_VIOLATED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("count".to_string(), _match_count.to_string()),
               ("limit".to_string(), max.to_string()),
             ])),

src/validator/rules/core.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 use crate::validator::Validator;
 use crate::validator::context::ValidationContext;
@@ -19,7 +19,7 @@ impl<'a> ValidationContext<'a> {
           if !Validator::check_type(t, current) {
             result.errors.push(ValidationError {
               code: "INVALID_TYPE".to_string(),
-              values: Some(HashMap::from([
+              values: Some(IndexMap::from([
                 ("expected".to_string(), t.to_string()),
               ])),
               path: self.path.to_string(),
@@ -37,7 +37,7 @@ impl<'a> ValidationContext<'a> {
           if !valid {
             result.errors.push(ValidationError {
               code: "INVALID_TYPE".to_string(),
-              values: Some(HashMap::from([
+              values: Some(IndexMap::from([
                 ("expected".to_string(), format!("{:?}", types)),
               ])),
               path: self.path.to_string(),
@@ -51,7 +51,7 @@ impl<'a> ValidationContext<'a> {
       if !equals(current, const_val) {
         result.errors.push(ValidationError {
           code: "CONST_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("expected".to_string(), format!("{:?}", const_val)),
           ])),
           path: self.path.to_string(),
@@ -74,7 +74,7 @@ impl<'a> ValidationContext<'a> {
       if !found {
         result.errors.push(ValidationError {
           code: "ENUM_MISMATCH".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("expected".to_string(), format!("{:?}", enum_vals)),
           ])),
           path: self.path.to_string(),

src/validator/rules/extensible.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 use crate::database::object::{is_primitive_type, SchemaTypeOrArray};
 use crate::database::schema::Schema;
@@ -75,7 +75,7 @@ impl<'a> ValidationContext<'a> {
           if !result.evaluated_keys.contains(key) && !self.overrides.contains(key) {
             result.errors.push(ValidationError {
               code: "STRICT_PROPERTY_VIOLATION".to_string(),
-              values: Some(HashMap::from([
+              values: Some(IndexMap::from([
                 ("property_name".to_string(), key.to_string()),
               ])),
               path: self.join_path(key),

src/validator/rules/format.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 use crate::validator::context::ValidationContext;
 use crate::validator::error::ValidationError;
@@ -21,7 +21,7 @@ impl<'a> ValidationContext<'a> {
           if should && let Err(e) = f(current) {
             result.errors.push(ValidationError {
               code: "FORMAT_MISMATCH".to_string(),
-              values: Some(HashMap::from([
+              values: Some(IndexMap::from([
                 ("format".to_string(), self.schema.format.clone().unwrap_or_default()),
                 ("error".to_string(), e.to_string()),
               ])),
@@ -35,7 +35,7 @@ impl<'a> ValidationContext<'a> {
           {
             result.errors.push(ValidationError {
               code: "FORMAT_MISMATCH".to_string(),
-              values: Some(HashMap::from([
+              values: Some(IndexMap::from([
                 ("format".to_string(), self.schema.format.clone().unwrap_or_default()),
               ])),
               path: self.path.to_string(),

src/validator/rules/mod.rs

@@ -1,7 +1,7 @@
 use crate::validator::context::ValidationContext;
 use crate::validator::error::ValidationError;
 use crate::validator::result::ValidationResult;
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 pub mod array;
 pub mod cases;
@@ -64,7 +64,7 @@ impl<'a> ValidationContext<'a> {
     if self.depth > 100 {
       Err(ValidationError {
         code: "RECURSION_LIMIT_EXCEEDED".to_string(),
-        values: Some(HashMap::from([
+        values: Some(IndexMap::from([
           ("limit".to_string(), 100.to_string()),
         ])),
         path: self.path.to_string(),

src/validator/rules/numeric.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 use crate::validator::context::ValidationContext;
 use crate::validator::error::ValidationError;
@@ -16,7 +16,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MINIMUM_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("value".to_string(), num.to_string()),
             ("limit".to_string(), min.to_string()),
           ])),
@@ -28,7 +28,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MAXIMUM_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("value".to_string(), num.to_string()),
             ("limit".to_string(), max.to_string()),
           ])),
@@ -40,7 +40,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "EXCLUSIVE_MINIMUM_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("value".to_string(), num.to_string()),
             ("limit".to_string(), ex_min.to_string()),
           ])),
@@ -52,7 +52,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "EXCLUSIVE_MAXIMUM_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("value".to_string(), num.to_string()),
             ("limit".to_string(), ex_max.to_string()),
           ])),
@@ -64,7 +64,7 @@ impl<'a> ValidationContext<'a> {
         if (val - val.round()).abs() > f64::EPSILON {
           result.errors.push(ValidationError {
             code: "MULTIPLE_OF_VIOLATED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("value".to_string(), num.to_string()),
               ("multiple_of".to_string(), multiple_of.to_string()),
             ])),

src/validator/rules/object.rs

@@ -1,4 +1,5 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::HashSet;
+use indexmap::IndexMap;
 
 use serde_json::Value;
 
@@ -38,7 +39,7 @@ impl<'a> ValidationContext<'a> {
               } else {
                 result.errors.push(ValidationError {
                   code: "CONST_VIOLATED".to_string(), // Aligning with original const override errors natively
-                  values: Some(HashMap::from([
+                  values: Some(IndexMap::from([
                     ("value".to_string(), type_str.to_string()),
                   ])),
                   path: self.join_path("type"),
@@ -49,7 +50,7 @@ impl<'a> ValidationContext<'a> {
             // Because it's a global entity target, the payload must structurally provide a discriminator natively
             result.errors.push(ValidationError {
               code: "MISSING_TYPE".to_string(),
-              values: Some(HashMap::from([
+              values: Some(IndexMap::from([
                 ("expected".to_string(), expected_type.to_string()),
               ])),
               path: self.path.clone(), // Empty boundary
@@ -104,7 +105,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MIN_PROPERTIES_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("count".to_string(), obj.len().to_string()),
             ("limit".to_string(), min.to_string()),
           ])),
@@ -117,7 +118,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MAX_PROPERTIES_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("count".to_string(), obj.len().to_string()),
             ("limit".to_string(), max.to_string()),
           ])),
@@ -131,7 +132,7 @@ impl<'a> ValidationContext<'a> {
             if field == "type" {
               result.errors.push(ValidationError {
                 code: "MISSING_TYPE".to_string(),
-                values: Some(HashMap::from([
+                values: Some(IndexMap::from([
                   ("field_name".to_string(), "type".to_string()),
                 ])),
                 path: self.join_path(field),
@@ -139,7 +140,7 @@ impl<'a> ValidationContext<'a> {
             } else {
               result.errors.push(ValidationError {
                 code: "REQUIRED_FIELD_MISSING".to_string(),
-                values: Some(HashMap::from([
+                values: Some(IndexMap::from([
                   ("field_name".to_string(), field.to_string()),
                 ])),
                 path: self.join_path(field),
@@ -158,7 +159,7 @@ impl<'a> ValidationContext<'a> {
                   if !obj.contains_key(req_prop) {
                     result.errors.push(ValidationError {
                       code: "DEPENDENCY_MISSING".to_string(),
-                      values: Some(HashMap::from([
+                      values: Some(IndexMap::from([
                         ("property_name".to_string(), prop.to_string()),
                         ("required_property".to_string(), req_prop.to_string()),
                       ])),

src/validator/rules/polymorphism.rs

@@ -1,5 +1,3 @@
-use std::collections::HashMap;
-
 use crate::validator::context::ValidationContext;
 use crate::validator::error::ValidationError;
 use crate::validator::result::ValidationResult;
@@ -55,10 +53,10 @@ impl<'a> ValidationContext<'a> {
         return self.execute_polymorph(options, result);
       } else {
         result.errors.push(ValidationError {
-            code: "UNCOMPILED_ONEOF".to_string(),
-            values: None,
-            path: self.path.to_string(),
-         });
+          code: "UNCOMPILED_ONEOF".to_string(),
+          values: None,
+          path: self.path.to_string(),
+        });
         return Ok(false);
       }
     }
@@ -110,9 +108,10 @@ impl<'a> ValidationContext<'a> {
           } else {
             result.errors.push(ValidationError {
               code: "MISSING_COMPILED_SCHEMA".to_string(),
-              values: Some(HashMap::from([
-                ("target_id".to_string(), target_id.to_string()),
-              ])),
+              values: Some(IndexMap::from([(
+                "target_id".to_string(),
+                target_id.to_string(),
+              )])),
               path: self.path.to_string(),
             });
             return Ok(false);
@@ -132,9 +131,7 @@ impl<'a> ValidationContext<'a> {
           } else {
             result.errors.push(ValidationError {
               code: "MISSING_COMPILED_SCHEMA".to_string(),
-              values: Some(HashMap::from([
-                ("index".to_string(), idx.to_string()),
-              ])),
+              values: Some(IndexMap::from([("index".to_string(), idx.to_string())])),
               path: self.path.to_string(),
             });
             return Ok(false);
@@ -144,14 +141,12 @@ impl<'a> ValidationContext<'a> {
         }
       } else {
         let values = if let Some(d) = self.schema.compiled_discriminator.get() {
-          Some(HashMap::from([
+          Some(IndexMap::from([
             ("discriminator".to_string(), d.to_string()),
             ("value".to_string(), val.to_string()),
           ]))
         } else {
-          Some(HashMap::from([
-            ("primitive".to_string(), val.to_string()),
-          ]))
+          Some(IndexMap::from([("primitive".to_string(), val.to_string())]))
         };
         result.errors.push(ValidationError {
           code: if self.schema.family.is_some() {
@@ -168,9 +163,10 @@ impl<'a> ValidationContext<'a> {
       if let Some(d) = self.schema.compiled_discriminator.get() {
         result.errors.push(ValidationError {
           code: "MISSING_TYPE".to_string(),
-          values: Some(HashMap::from([
-            ("discriminator".to_string(), d.to_string()),
-          ])),
+          values: Some(IndexMap::from([(
+            "discriminator".to_string(),
+            d.to_string(),
+          )])),
           path: self.path.to_string(),
         });
       }

src/validator/rules/string.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 use crate::validator::context::ValidationContext;
 use crate::validator::error::ValidationError;
@@ -17,7 +17,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MIN_LENGTH_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("count".to_string(), s.chars().count().to_string()),
             ("limit".to_string(), min.to_string()),
           ])),
@@ -29,7 +29,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "MAX_LENGTH_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("count".to_string(), s.chars().count().to_string()),
             ("limit".to_string(), max.to_string()),
           ])),
@@ -40,7 +40,7 @@ impl<'a> ValidationContext<'a> {
         if !compiled_re.0.is_match(s) {
           result.errors.push(ValidationError {
             code: "PATTERN_VIOLATED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("pattern".to_string(), self.schema.pattern.clone().unwrap_or_default()),
               ("value".to_string(), s.to_string()),
             ])),
@@ -53,7 +53,7 @@ impl<'a> ValidationContext<'a> {
       {
         result.errors.push(ValidationError {
           code: "PATTERN_VIOLATED".to_string(),
-          values: Some(HashMap::from([
+          values: Some(IndexMap::from([
             ("pattern".to_string(), pattern.to_string()),
             ("value".to_string(), s.to_string()),
           ])),

src/validator/rules/type.rs

@@ -2,7 +2,7 @@ use crate::database::object::{is_primitive_type, SchemaTypeOrArray};
 use crate::validator::context::ValidationContext;
 use crate::validator::error::ValidationError;
 use crate::validator::result::ValidationResult;
-use std::collections::HashMap;
+use indexmap::IndexMap;
 
 impl<'a> ValidationContext<'a> {
   pub(crate) fn validate_type(
@@ -76,7 +76,7 @@ impl<'a> ValidationContext<'a> {
         if !resolved {
           result.errors.push(ValidationError {
             code: "DYNAMIC_TYPE_RESOLUTION_FAILED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("pointer".to_string(), t.clone()),
               ("discriminator".to_string(), var_name.to_string()),
             ])),
@@ -109,7 +109,7 @@ impl<'a> ValidationContext<'a> {
         if t.starts_with('$') {
           result.errors.push(ValidationError {
             code: "DYNAMIC_TYPE_RESOLUTION_FAILED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("pointer".to_string(), target_id.to_string()),
             ])),
             path: self.path.to_string(),
@@ -117,7 +117,7 @@ impl<'a> ValidationContext<'a> {
         } else if self.schema.is_proxy() {
           result.errors.push(ValidationError {
             code: "PROXY_TYPE_RESOLUTION_FAILED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("pointer".to_string(), target_id.to_string()),
             ])),
             path: self.path.to_string(),
@@ -125,7 +125,7 @@ impl<'a> ValidationContext<'a> {
         } else {
           result.errors.push(ValidationError {
             code: "INHERITANCE_RESOLUTION_FAILED".to_string(),
-            values: Some(HashMap::from([
+            values: Some(IndexMap::from([
               ("pointer".to_string(), target_id.to_string()),
             ])),
             path: self.path.to_string(),

version

@@ -1 +1 @@
-1.0.179
+1.0.182