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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Request body with oneOf schema not generated correctly","articleBody":"When using a schema with oneOf in the requestBody the code is not generated accoring to the documentation.\n\n**Version v2.4.1**\n\nopenapi.yaml\n```yaml\nopenapi: 3.0.1\ninfo:\n  title: openapi test\n  version: v0.0.1\n\npaths:\n  /change:\n    post:\n      operationId: change\n      requestBody:\n        description: the request\n        required: true\n        content:\n          application/json:\n            schema:\n              oneOf:\n                - $ref: '#/components/schemas/NameChange'\n                - $ref: '#/components/schemas/AddressChange'\n              discriminator:\n                propertyName: changeType\n                mapping:\n                  name: '#/components/schemas/NameChange'\n                  address: '#/components/schemas/AddressChange'\n      responses:\n        200:\n          description: OK\n          content:\n            application/json:\n              schema:\n                type: object\n                properties:\n                  response:\n                    type: object\n                    description: Object containing the response.\n                    properties:\n                      changeType:\n                        type: string\n                        description: the type of change made\n\ncomponents:\n  schemas:\n    Change:\n      type: object\n      required:\n        - changeType\n      properties:\n        changeType:\n          type: string\n    NameChange:\n      allOf:\n        - $ref: '#/components/schemas/Change'\n        - type: object\n          required:\n            - newName\n          properties:\n            newName:\n              type: string\n    AddressChange:\n      allOf:\n        - $ref: '#/components/schemas/Change'\n        - type: object\n          required:\n            - newAddress\n          properties:\n            newAddress:\n              type: string\n\n```\n\n**Expected**\nAccording to the documentation there should be helper methods generated like the following:\n```go\nfunc (t *ChangeJSONRequestBody) FromNameChange(v NameChange) error {\n\tb, err := json.Marshal(v)\n\tt.union = b\n\treturn err\n}\n```\n\n**Actual**\nThe types are generated but without helper methods as you can see in this [example](https://github.com/m-kay/go-openapi-oneof-codegen/blob/main/oneof.gen.go)","author":{"url":"https://github.com/m-kay","@type":"Person","name":"m-kay"},"datePublished":"2025-07-10T08:43:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/2018/oapi-codegen/issues/2018"}