feat: Handle oneOf/anyOf with inline object variants

examples/OpenApiCodeGenerator.Examples/README.md

@@ -24,6 +24,7 @@ The local showcase spec is intentionally compact and demonstrates:
 - `allOf` inheritance
 - `oneOf` discriminator generation
 - `anyOf` union generation
+- `oneOf` with inline object variants (hoisted to named records with `[JsonDerivedType]`)
 - string enums and inline enums
 - arrays, nullable fields, and `additionalProperties`
 - `deprecated` schemas and properties emitted with `[Obsolete]`

examples/OpenApiCodeGenerator.Examples/output/showcase-openapi.cs

@@ -143,20 +143,6 @@ public enum Status
     Failed
 }
 
-[JsonConverter(typeof(JsonStringEnumConverter<CircleShapeType>))]
-public enum CircleShapeType
-{
-    [JsonStringEnumMemberName("circle")]
-    Circle
-}
-
-[JsonConverter(typeof(JsonStringEnumConverter<RectangleShapeType>))]
-public enum RectangleShapeType
-{
-    [JsonStringEnumMemberName("rectangle")]
-    Rectangle
-}
-
 /// <summary>
 /// Strongly typed UUID alias.
 /// </summary>
@@ -297,22 +283,16 @@ public partial record DeliveryRecord : DeliveryBase
 
 }
 
-public partial record Circle
+public partial record Circle : Shape
 {
-    [JsonPropertyName("shapeType")]
-    public required CircleShapeType ShapeType { get; init; }
-
     [Range(0d, 1000d)]
     [JsonPropertyName("radius")]
     public required double Radius { get; init; }
 
 }
 
-public partial record Rectangle
+public partial record Rectangle : Shape
 {
-    [JsonPropertyName("shapeType")]
-    public required RectangleShapeType ShapeType { get; init; }
-
     [JsonPropertyName("width")]
     public required double Width { get; init; }
 
@@ -360,6 +340,12 @@ public partial record Notification
     [JsonPropertyName("contact")]
     public required ContactMethod Contact { get; init; }
 
+    /// <summary>
+    /// oneOf with mixed ref and inline object variants. The inline object is hoisted to a named record and the union is emitted as an abstract record with [JsonDerivedType] attributes.
+    /// </summary>
+    [JsonPropertyName("escalation")]
+    public required object Escalation { get; init; }
+
     /// <summary>
     /// Superseded by contact; retained for backward compatibility.
     /// </summary>

examples/OpenApiCodeGenerator.Examples/specs/showcase-openapi.yaml

@@ -174,13 +174,31 @@ components:
         - record
         - preferredShape
         - contact
+        - escalation
       properties:
         record:
           $ref: '#/components/schemas/DeliveryRecord'
         preferredShape:
           $ref: '#/components/schemas/Shape'
         contact:
           $ref: '#/components/schemas/ContactMethod'
+        escalation:
+          description: >-
+            oneOf with mixed ref and inline object variants. The inline object
+            is hoisted to a named record and the union is emitted as an abstract
+            record with [JsonDerivedType] attributes.
+          oneOf:
+            - $ref: '#/components/schemas/EmailContact'
+            - type: object
+              description: Inline escalation variant hoisted to a named record.
+              required:
+                - phone
+              properties:
+                phone:
+                  type: string
+                  pattern: '^\+?[0-9]{6,15}$'
+                afterHours:
+                  type: boolean
         legacyChannel:
           type: string
           deprecated: true