diff --git a/packages/fabric/domain/src/models/fields/index.ts b/packages/fabric/domain/src/models/fields/index.ts
index acdfdc2..f70e4e4 100644
--- a/packages/fabric/domain/src/models/fields/index.ts
+++ b/packages/fabric/domain/src/models/fields/index.ts
@@ -3,6 +3,7 @@ import { createReferenceField, ReferenceField } from "./reference-field.js";
 import { createStringField, StringField } from "./string-field.js";
 import { createUUIDField, UUIDField } from "./uuid-field.js";
 export * from "./base-field.js";
+export * from "./reference-field.js";
 
 export type FieldDefinition =
   | StringField
diff --git a/packages/fabric/domain/src/models/fields/reference-field.ts b/packages/fabric/domain/src/models/fields/reference-field.ts
index 9dbcfc9..b8272ec 100644
--- a/packages/fabric/domain/src/models/fields/reference-field.ts
+++ b/packages/fabric/domain/src/models/fields/reference-field.ts
@@ -20,6 +20,10 @@ export function createReferenceField<T extends ReferenceFieldOptions>(
   } as const;
 }
 
+export function getTargetKey(field: ReferenceField): string {
+  return field.targetKey || "id";
+}
+
 export function validateReferenceField(
   schema: ModelSchema,
   field: ReferenceField,