René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unusable code for schema response with oneOf","articleBody":"Hello, I've looked for duplicate, but could not find exactly the same bug (as far as I searched), here are related ones:\n- https://github.com/oapi-codegen/oapi-codegen/issues/626\n- https://github.com/oapi-codegen/oapi-codegen/issues/1496\n- https://github.com/oapi-codegen/oapi-codegen/issues/1872\n- https://github.com/oapi-codegen/oapi-codegen/issues/1882\n- https://github.com/oapi-codegen/oapi-codegen/issues/1665\n\nAnd a related PR: \n- https://github.com/oapi-codegen/oapi-codegen/pull/648\n\n## Steps to reproduce:\n\nI've created minimal reproduction code [here](https://github.com/aBMania/oapi-codegen/tree/bug/1900/internal/test/issues/issue-1900)\n\n### 1. OpenAPI Spec\n\n```yaml\nopenapi: 3.0.2\ninfo:\n  version: 1.0.0\n  title: Issue 1900\npaths:\n  /ping:\n    get:\n      responses:\n        '200':\n          content:\n            application/json:\n              schema:\n                oneOf:\n                  - $ref: '#/components/schemas/Pong1'\n                  - $ref: '#/components/schemas/Pong2'\n                  - $ref: '#/components/schemas/Pong3'\n```\n\n### 2. Oapi-codegen config\n\n```yaml\npackage: issue1900\noutput: ping.gen.go\ngenerate:\n  models: true\n  client: true\n```\n\n### 3. Generated code\n\n```go\ntype GetPingResponse struct {\n\tBody         []byte\n\tHTTPResponse *http.Response\n\tJSON200      *struct {\n\t\tunion json.RawMessage\n\t}\n\tJSON404 *Error\n}\n```\n\nHere the `JSON200` type is unusable\n\n## Workaround\n\nAs a workaround, I've manually modified the OpenAPI spec of the API we are using before generating code:\n\n```yaml\n# Changed:\n'/Ping':\n  get:\n    # ...\n    responses:\n      '200':\n        content:\n          application/json:\n            schema:\n              $ref: \"#/components/schemas/PongResponse\"\n\n# Added: \n  schemas:\n    # ...\n    PongResponse:\n      oneOf:\n        - $ref: \"#/components/schemas/Pong1\"\n        - $ref: \"#/components/schemas/Pong2\"\n        - $ref: \"#/components/schemas/Pong3\"\n    # ...\n```\n\nAnd it's now generating a usable type: \n```go\ntype GetPingResponse struct {\n\tBody         []byte\n\tHTTPResponse *http.Response\n\tJSON200      *PongResponse  // generated type here\n\tJSON404      *Error\n}\nfunc (t PongResponse) AsPong1() (Pong1, error) { ... }\nfunc (t PongResponse) AsPong2() (Pong2, error) { ... }\n// ...\n```","author":{"url":"https://github.com/aBMania","@type":"Person","name":"aBMania"},"datePublished":"2025-02-12T09:20:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/1900/oapi-codegen/issues/1900"}