[BUG][GO] Generating golang models from openapi 3.3 containing oneOf results in undefined struct

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What’s the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Using the generator to generate models for golang it generates models that are not defined. I am unsure if this is configuration or limitation.

openapi-generator version

Openapi-generator-cli docker-hub: Digest:sha256:829f0b601005c28950ed55c65d853f2caead265730782b2c7c48812bf8135222

OpenAPI declaration file content or url

{
  "openapi": "3.0.3",
  "info": {
    "title": "Exampleapi",
    "version": "2.0.0"

  },
  "paths": {
    "/temp": {
      "get": {
        "responses": {
          "200": {
            "description":"Tmp",
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "Foo": {
        "type": "object",
        "properties": {
          "Bar": {
            "oneOf": [
              {"$ref": "#/components/schemas/FooBar"},
              {"$ref": "#/components/schemas/BarFoo"}
            ]
          }
        }
      },
      "FooBar": {
        "type": "object",
        "title": "FooBar",
        "properties": {
          "example": {
            "type": "string"
          }
        }
      },
      "BarFoo": {
        "type": "object",
        "title": "BarFoo",
        "properties": {
          "example": {
            "type": "string"
          }
        }
      }
    }
  }
}

Generation Details

Generation command

openapi-generator-cli generate \
        -i "/swagger.json" \
        -g go \
        --global-property models,supportingFiles=utils.go,modelDocs=false \
        --additional-properties  \
        --minimal-update \
        -p enumClassPrefix=true \
        --enable-post-process-file \
        --additional-properties packageName="Some Name" \
        -o "/Some_Location"

Steps to reproduce

Run above code on above swagger to replicate. The result given the expectations will result in:

type Foo struct {
    Bar *OneOfFooBarBarFoo `json:"Bar,omitempty"` <-- Undefined
}

Where OneOfFooBarBarFoo is not defined.

Related issues/PRs

No

Suggest a fix

Given go does not support generics a resonable response would be:

type Foo struct {
    Bar *interface{} `json:"Bar,omitempty"`
}

[bmason42]

Same issue, any progress seen on this?

[ligertsicat]

Leaving this in case anyone else runs into this bug (top result from google), since it’s unclear.

Using oneOf directly causes problems when generating the sdk

requestBody: content: application/json: schema: oneOf: - $ref: ‘#/components/schemas/Object1’ - $ref: ‘#/components/schemas/Object2’

However, this can be fixed by placing the above into a separate object

requestBody: content: application/json: schema: $ref: ‘#/components/schemas/Object3’

Object3: oneOf: - $ref: ‘#/components/schemas/Object1’ - $ref: ‘#/components/schemas/Object2’