warning: invalid allOf variant warning if allOf includes oneOf

[corneliu-petrescu]

Hi,

We're seeing a parse warning when trying to lint the following API spec:

Example: -- invalid allOf variant

---
openapi: 3.0.3
info:
title: Test
version: 3.0.0
servers:
- url: /test
  description: Test
tags:
- name: Test
  description: test
paths:
/test:
  post:
    description: test
    operationId: test
    tags:
      - Test
    requestBody:
      content:
        application/vnd.api+json:
          schema:
            allOf:
              - type: object
                properties:
                  prop1:
                     type: string
                required: [prop1]
              - oneOf:
                  - type: object
                    properties:
                      prop2:
                        type: string
                  - type: object
                    properties:
                      prop3:
                        type: string
    responses:
      '201':
        description: success
        content:
          application/vnd.api+json:
            schema:
              type: object
          location:
            schema:
              type: string

[niclim]

Ah interesting, it looks like our mergeAllOf handler doesn't handle this case.

This might be a little trickier to implement, given each oneOf child would result in a top level polymorphic item, and you could have multiple oneOf children which would result in all combinations of polymorphic options.

[corneliu-petrescu]

We have 2 or 3 APIs that use the above approach. What would be the impact of it at this moment?
Is it just a warning?

[niclim]

I think right now it'll exclude values in oneOf blocks that are nested inside of an allOf block. This would affect the diff that's generated and rules run against it.

[corneliu-petrescu]

For now I'm investigating rewriting some of the schemas using

oneOf
 - allOf
     prop1
     prop2
 - allOf
     prop1
     prop3
     ```
 This does not give any warnings
     

[checkin247]

I think I just came across the same ...

optic diff reference\Configuration.yaml --last-change 

1. invalid allOf variant at reference\Configuration.yaml:103:3535
   this is a model with a allOf of two models, where the second model has a oneOf (many)
2. Operations: No operations changed
   where I have remove the required attribute of a property in a Model listed in the oneOf

[Relequestual]

Hit this issue today when using the Train Travel OADs.
https://github.com/bump-sh-examples/train-travel-api

These are a good baseline for testing support.
I downgraded them to OAS 3.0 for testing diff tooling.

I get the same error https://github.com/bump-sh-examples/train-travel-api/blob/87d810c1371409178380032cf48ab0eb26fa9b78/openapi.yaml#L124-L135