allOf in $ref schema doesn't render properly

[karlismelderis]

Q&A (please complete the following information)

used online version: https://editor.swagger.io/

• OS: macOS
• Browser: chrome

Content & configuration

Example Swagger/OpenAPI definition:

components:
    schemas:
      evidenceA:
        properties:
          anotherA:
            type: string
        type: object
      evidenceB:
        allOf:
          - properties:
              anotherB:
                type: string
            type: object
      Demo:
          properties:
              evidenceB:
                $ref: '#/components/schemas/evidenceB'
              evidenceA:
                $ref: '#/components/schemas/evidenceA'
          type: object
      ResponseBody:
          properties:
              _embedded:
                  $ref: '#/components/schemas/Demo'
          required:
              - _embedded
          type: object
info:
    title: 'test'
    version: 3.4.0
    description: 'Demo'
    contact: {}
openapi: 3.0.0
paths:
    '/test':
        put:
            responses:
                '200':
                    description: 'Update or Create'
                    content:
                        application/json:
                            schema:
                                $ref: '#/components/schemas/ResponseBody'
            requestBody:
                required: true
                content:
                    application/json:
                        schema:
                            $ref: '#/components/schemas/Demo'

Describe the bug you're encountering

if $ref schema has allOf in it final schema is not rendered correctly. UI shows empty object and renders as string.

Screenshots

Additional context or thoughts

[shj95]

I'm having same issue. Is there any workaround?

[aarbmx6s]

I have the same problem.

@karlismelderis did you figure out this issue?

An example of document:

openapi: 3.0.1

info:
  version: 1.0.0
  title: API
  description: Test

components:
  schemas:
    ItemSimple:
      type: object
      properties:
        id:
          type: string

    GroupTitle:
      type: object
      properties:
        title:
          type: string

    GroupListItem:
      type: object
      properties:
        merged:
          allOf:
            - $ref: '#/components/schemas/ItemSimple'
            - type: object
              properties:
                extra:
                  type: string
            
    Group:
      type: object
      properties:
        title:
          $ref: '#/components/schemas/GroupTitle'
        list:
          type: array
          items:
            $ref: '#/components/schemas/GroupListItem'

paths:
  /path:
    get:
      summary: Some path
      responses:
        200:
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Group'

If allOf property change to anyOf or oneOf it recognises and renders as expected, but with allOf property it renders as string but expected to be a merged object.

[alexey-salmin-navee]

Moving paths above components seem to help.

https://stackoverflow.com/questions/69906612/swagger-example-response-not-respecting-nested-allof
swagger-api/swagger-ui#5972

Probably swagger-ui is a better repo for this bug, it's rendering of documentation that is buggy, not the editor.