Recursive types: Bug for struct with multiple recursive fields or oneOf

[allengu01]

What version of ogen are you using?

v1.2.2

Can this issue be reproduced with the latest version?

Yes

What did you do?

For the schema below, generating gives an error. However, removing either the b or c field under the schema for A works.

invalid recursive type A
oas_schemas_gen.go(6, 6): A refers to
oas_schemas_gen.go(162, 6): OptC refers to
oas_schemas_gen.go(47, 6): C refers to
oas_schemas_gen.go(70, 6): OptA refers to
oas_schemas_gen.go(6, 6): A

openapi: 3.0.2
servers:
  - url: /api/v1
info:
  version: 1.0.0
  title: Test API
paths:
  /test:
    post:
      operationId: test
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/A'
      responses:
        '200':
          content:
            application/json:
              schema:
                type: string

components:    
  schemas:
    A:
      type: object
      properties:
        b:
          $ref: '#/components/schemas/B'
        c:
          $ref: '#/components/schemas/C'
    B:
      type: object
      properties:
        a:
          $ref: '#/components/schemas/A'
    C:
      type: object
      properties:
        a:
          $ref: '#/components/schemas/A'

Having a recursive field within oneOf also errors:

openapi: 3.0.2
servers:
  - url: /api/v1
info:
  version: 1.0.0
  title: Test API
paths:
  /test:
    post:
      operationId: test
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/A'
      responses:
        '200':
          content:
            application/json:
              schema:
                type: string

components:    
  schemas:
    A:
      type: object
      properties:
        b:
          $ref: '#/components/schemas/B'
    B:
      type: object
      properties:
        a:
          oneOf:
            - $ref: '#/components/schemas/A'
            - type: boolean

What did you expect to see?

From the docs, recursive types should be using pointers to avoid errors with Golang structs.

What did you see instead?

A's type looks like:

type A struct {
	B OptB `json:"b"`
	C OptC `json:"c"`
}

B's type looks like:

type B struct {
	A *A `json:"a"`
}

C's type, however, looks like:

type C struct {
	A OptA `json:"a"`
}

[allengu01]

fixed in v1.3.0