René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Model Composition with ‘allOf’ Is Missing Fields","articleBody":"**Describe the bug**\nUsing a composition model (https://spec.openapis.org/oas/v3.0.4.html#models-with-composition) does not generate the target type but only the underlying type. For a type `A` which consists of the fields of `B` and some additional fields, only `B` is generated. Furthermore, `A` is replaced by `B`.\n\nThe spec below generates the following function:\n\n```py\ndef sync_detailed(\n    *,\n    client: AuthenticatedClient | Client,\n    body: Base,\n) -\u003e Response[Any]: ...\n```\n\nI would expect that the model `Network` is generated and used instead of `Base`. The `Network` model should include the field of `Base` and the field `non_base_field`.\n\n**OpenAPI Spec File**\n```yaml\nopenapi: 3.0.0\ninfo:\n  title: Service\n  version: 0.0.0\npaths:\n  /widgets:\n    get:\n      responses:\n        \"200\":\n          description: The request has succeeded.\n          content:\n            application/json:\n              schema:\n                nullable: true\n      requestBody:\n        required: true\n        content:\n          application/json:\n            schema:\n              $ref: \"#/components/schemas/Network\"\ncomponents:\n  schemas:\n    Base:\n      type: object\n      required:\n        - base_field\n      properties:\n        base_field:\n          type: string\n    Network:\n      type: object\n      required:\n        - non_base_field\n      properties:\n        non_base_field:\n          type: string\n      allOf:\n        - $ref: \"#/components/schemas/Base\"\n```\n\n**Desktop (please complete the following information):**\n - OS: Linux \n - Python Version: 3.13.11\n - openapi-python-client version: 0.28.1\n\n**Additional context**\nAdd any other context about the problem here.\n","author":{"url":"https://github.com/jmpunkt","@type":"Person","name":"jmpunkt"},"datePublished":"2026-01-30T20:01:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1392/openapi-python-client/issues/1392"}