{
  "openapi": "3.0.3",
  "info": {
    "title": "Discriminator object schema with self mapping",
    "version": "1.0.0",
    "description": "Ensures a concrete schema with a discriminator mapping to itself gets a literal discriminator value instead of falling back to string."
  },
  "paths": {
    "/blog-posts": {
      "get": {
        "summary": "Get blog posts",
        "responses": {
          "200": {
            "description": "List of blog posts",
            "content": {
              "application/json": {
                "schema": {
                  "type": "array",
                  "items": {
                    "oneOf": [
                      { "$ref": "#/components/schemas/BlogPostDto" },
                      { "$ref": "#/components/schemas/BlogPostWithImageDto" }
                    ]
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "BlogPostDto": {
        "type": "object",
        "required": ["$type", "id", "title"],
        "properties": {
          "$type": {
            "type": "string"
          },
          "id": {
            "type": "integer"
          },
          "title": {
            "type": "string"
          }
        },
        "discriminator": {
          "propertyName": "$type",
          "mapping": {
            "BlogPost": "#/components/schemas/BlogPostDto",
            "BlogPostWithImage": "#/components/schemas/BlogPostWithImageDto"
          }
        }
      },
      "BlogPostWithImageDto": {
        "allOf": [
          { "$ref": "#/components/schemas/BlogPostDto" },
          {
            "type": "object",
            "required": ["imageUrl"],
            "properties": {
              "imageUrl": {
                "type": "string"
              }
            }
          }
        ]
      }
    }
  }
}