a few tweaks

src/database/mod.rs

@@ -121,7 +121,7 @@ impl Database {
         if !visited.insert(current_id.clone()) {
           break; // Cycle detected
         }
-        if let Some(ref_str) = &schema.obj.ref_string {
+        if let Some(ref_str) = &schema.obj.r#ref {
           current_id = ref_str.clone();
           depth += 1;
         } else {
@@ -136,7 +136,7 @@ impl Database {
   fn collect_descendants(&mut self) {
     let mut direct_refs: HashMap<String, Vec<String>> = HashMap::new();
     for (id, schema) in &self.schemas {
-      if let Some(ref_str) = &schema.obj.ref_string {
+      if let Some(ref_str) = &schema.obj.r#ref {
         direct_refs
           .entry(ref_str.clone())
           .or_default()

src/database/schema.rs

@@ -11,7 +11,7 @@ pub struct SchemaObject {
   #[serde(rename = "$id")]
   pub id: Option<String>,
   #[serde(rename = "$ref")]
-  pub ref_string: Option<String>,
+  pub r#ref: Option<String>,
   /*
      Note: The `Ref` field in the Go struct is a pointer populated by the linker.
      In Rust, we might handle this differently (e.g., separate lookup or Rc/Arc),
@@ -306,7 +306,7 @@ impl<'de> Deserialize<'de> for Schema {
       && obj.if_.is_none()
       && obj.then_.is_none()
       && obj.else_.is_none()
-      && obj.ref_string.is_none()
+      && obj.r#ref.is_none()
       && obj.family.is_none();
 
     if is_empty && obj.extensible.is_none() {

src/validator/rules/object.rs

@@ -14,7 +14,7 @@ impl<'a> ValidationContext<'a> {
     let current = self.instance;
     if let Some(obj) = current.as_object() {
       // Entity Bound Implicit Type Validation
-      if let Some(lookup_key) = self.schema.id.as_ref().or(self.schema.ref_string.as_ref()) {
+      if let Some(lookup_key) = self.schema.id.as_ref().or(self.schema.r#ref.as_ref()) {
         let base_type_name = lookup_key.split('.').next_back().unwrap_or("").to_string();
         if let Some(type_def) = self.db.types.get(&base_type_name)
           && let Some(type_val) = obj.get("type")
@@ -99,7 +99,7 @@ impl<'a> ValidationContext<'a> {
 
           if let Some(child_instance) = obj.get(key) {
             let new_path = format!("{}/{}", self.path, key);
-            let is_ref = sub_schema.ref_string.is_some();
+            let is_ref = sub_schema.r#ref.is_some();
             let next_extensible = if is_ref { false } else { self.extensible };
 
             let derived = self.derive(
@@ -114,7 +114,7 @@ impl<'a> ValidationContext<'a> {
 
             // Entity Bound Implicit Type Interception
             if key == "type"
-              && let Some(lookup_key) = sub_schema.id.as_ref().or(sub_schema.ref_string.as_ref())
+              && let Some(lookup_key) = sub_schema.id.as_ref().or(sub_schema.r#ref.as_ref())
             {
               let base_type_name = lookup_key.split('.').next_back().unwrap_or("").to_string();
               if let Some(type_def) = self.db.types.get(&base_type_name)
@@ -138,7 +138,7 @@ impl<'a> ValidationContext<'a> {
           for (key, child_instance) in obj {
             if compiled_re.0.is_match(key) {
               let new_path = format!("{}/{}", self.path, key);
-              let is_ref = sub_schema.ref_string.is_some();
+              let is_ref = sub_schema.r#ref.is_some();
               let next_extensible = if is_ref { false } else { self.extensible };
 
               let derived = self.derive(
@@ -177,7 +177,7 @@ impl<'a> ValidationContext<'a> {
 
           if !locally_matched {
             let new_path = format!("{}/{}", self.path, key);
-            let is_ref = additional_schema.ref_string.is_some();
+            let is_ref = additional_schema.r#ref.is_some();
             let next_extensible = if is_ref { false } else { self.extensible };
 
             let derived = self.derive(

src/validator/rules/polymorphism.rs

@@ -13,7 +13,7 @@ impl<'a> ValidationContext<'a> {
         || self.schema.required.is_some()
         || self.schema.additional_properties.is_some()
         || self.schema.items.is_some()
-        || self.schema.ref_string.is_some()
+        || self.schema.r#ref.is_some()
         || self.schema.one_of.is_some()
         || self.schema.all_of.is_some()
         || self.schema.enum_.is_some()
@@ -122,7 +122,7 @@ impl<'a> ValidationContext<'a> {
     result: &mut ValidationResult,
   ) -> Result<bool, ValidationError> {
     // 1. Core $ref logic relies on the fast O(1) map to allow cycles and proper nesting
-    if let Some(ref_str) = &self.schema.ref_string {
+    if let Some(ref_str) = &self.schema.r#ref {
       if let Some(global_schema) = self.db.schemas.get(ref_str) {
         let mut new_overrides = self.overrides.clone();
         if let Some(props) = &self.schema.properties {