Go (client) is not able to generate code that compiles for allOf

[rikotsev]

Is your feature request related to a problem? Please describe.

I have a schema in which an object is constructed from allOf with multiple refs, one of the refs itself has a discriminator field that points to the object.

Currently, the code cannot compile because the model_simple.mustache uses allVars in the helper (constructor) func while the struct has fields only coming from vars

Describe the solution you'd like

I would like the resulting code to have all the fields needed.

Describe alternatives you've considered

One alternative would be to build the schema as:

    FinalItem:
      type: object
      allOf:
        - allOf:
           - $ref: '#/components/schemas/BaseItem'
        - allOf:
            - $ref: '#/components/schemas/AdditionalData'

Additional context

This is an example schema for this:

openapi: 3.0.0
info:
  title: Test
  version: 1.0.0
paths: {}
components:
  schemas:
    FinalItem:
      type: object
      allOf:
        - $ref: '#/components/schemas/BaseItem'
        - $ref: '#/components/schemas/AdditionalData'
    BaseItem:
      type: object
      properties:
        title:
          type: string
        type:
          type: string
          enum:
            - FINAL
          example: FINAL
      discriminator:
        propertyName: type
        mapping:
          FINAL: '#/components/schemas/FinalItem'
      required:
        - title
        - type
    AdditionalData:
      type: object
      properties:
        prop1:
          type: string
        quantity:
          type: integer
          format: int32
          example: 1
          minimum: 1
        unitPrice:
          type: number
          format: double
          example: 9.99
          minimum: 0.0
        totalPrice:
          type: number
          format: double
          example: 9.99
          minimum: 0.0
      required:
        - sku
        - quantity
        - unitPrice
        - totalPrice

[rikotsev]

I've added an example proposal:

#18390