[BUG][golang] NullableInt32 and AnyOfstringstring are not generated for golang

[Pisztrang]

hi

I have this yaml file.

openapi: 3.0.0

info:
  version: '1.0.0'
  title: 'Types'

paths: {}
components:
  schemas:

    AdditionalQosFlowInfo:
      anyOf:
        - anyOf:
            - type: string
              enum:
                - MORE_LIKELY
            - type: string
        - $ref: '#/components/schemas/NullValue'

    Arp:
      type: object
      properties:
        priorityLevel:
          $ref: '#/components/schemas/ArpPriorityLevel'
      required:
        - priorityLevel

    ArpPriorityLevel:
      type: integer
      nullable: true

    NullValue:
      enum:
        - null

there is a nullable type in it and an anyof/anyof type.

When I genarte go models for this, the generator does not generate NullableInt32 and AnyOfstringstring models, but there are some reference in the generated models, which are using those

E.g.

type Arp struct {
	// nullable true shall not be used for this attribute
	PriorityLevel NullableInt32 `json:"priorityLevel"`
}

type AdditionalQosFlowInfo struct {
	AnyOfstringstring *AnyOfstringstring
	NullValue *NullValue
}

But there is no model for this NullableInt32 and for AnyOfstringstring, so it shows an error....

Can you tell me what I am doing wrong? Why this is not generated? Or am I misunderstand something?
thanks
Akos

[chris-annino-sp]

Hi Pisztrang,
I have been seeing the same issue when generating a rather large yaml spec from Microsoft. For me it seems to be related to the use of anyOf. I've slimmed down the yaml to just repro the issue. Here's my dets:

---

after starting my docker container using openapitools/openapi-generator-cli:v5.3.1 I use the command:

./docker-entrypoint.sh generate -g go -i /gen/msgraph-metadata/access.yaml -o /gen/msgraph-metadata/gen --global-property modelTests=false,modelDocs=false

it seems anything defined using an anyOf with a nullable:true will generate types that are not defined. If there was a way to remove the AnyOf it would compile (not sure about runtime though).
I turned on verbose mode

      "openApiType" : "anyOf<microsoft.graph.accessPackageCatalog>",
      "baseName" : "catalog",
      "complexType" : "anyOf<microsoft.graph.accessPackageCatalog>",
      "getter" : "GetCatalog",
      "setter" : "setCatalog",
      "description" : "Read-only. Nullable.",
      "dataType" : "NullableAnyOfmicrosoftGraphAccessPackageCatalog",
      "datatypeWithEnum" : "AnyOfmicrosoftGraphAccessPackageCatalog",
      "name" : "Catalog",

and am looking at the go mustache template model_simple.mustache where it uses the datatype. Based on verbose mode, it feels like this is not isolated to go. I just confirmed using java

[ERROR] gen-java/src/main/java/org/openapitools/client/model/MicrosoftGraphAccessPackageCatalog.java:[123,23] error: cannot find symbol
[ERROR]   symbol:   class AnyOfmicrosoftGraphAccessPackageCatalogState
[ERROR]   location: class MicrosoftGraphAccessPackageCatalog

and finally the small yaml stripped down from ms

openapi: 3.0.1
info:
  title: Partial Graph API
  version: v1.0
servers:
  - url: https://graph.microsoft.com/v1.0/
    description: Core
paths: {}
components:
  schemas:
    microsoft.graph.entity:
     title: entity
     type: object
     properties:
       id:
         type: string
         description: Read-only.
    microsoft.graph.accessPackage:
      allOf:
        - $ref: '#/components/schemas/microsoft.graph.entity'
        - title: accessPackage
          type: object
          properties:
            catalog:
              anyOf:
                - $ref: '#/components/schemas/microsoft.graph.accessPackageCatalog'
              description: Read-only. Nullable.
              nullable: true
    microsoft.graph.accessPackageCatalog:
      allOf:
        - $ref: '#/components/schemas/microsoft.graph.entity'
        - title: accessPackageCatalog
          type: object
          properties:
            catalogType:
              anyOf:
                - $ref: '#/components/schemas/microsoft.graph.accessPackageCatalogType'
              description: 'Whether the catalog is created by a user or entitlement management. The possible values are: userManaged, serviceDefault, serviceManaged, unknownFutureValue.'
              nullable: true
            state:
              anyOf:
                - $ref: '#/components/schemas/microsoft.graph.accessPackageCatalogState'
              description: 'Has the value published if the access packages are available for management. The possible values are: unpublished, published, unknownFutureValue.'
              nullable: true
            accessPackages:
              type: array
              items:
                $ref: '#/components/schemas/microsoft.graph.accessPackage'
              description: The access packages in this catalog. Read-only. Nullable.
    microsoft.graph.accessPackageCatalogType:
      title: accessPackageCatalogType
      enum:
        - userManaged
        - serviceDefault
        - serviceManaged
        - unknownFutureValue
      type: string
    microsoft.graph.accessPackageCatalogState:
      title: accessPackageCatalogState
      enum:
        - unpublished
        - published
        - unknownFutureValue
      type: string
  securitySchemes:
    azureaadv2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://login.microsoftonline.com/common/oauth2/v2.0/authorize
          tokenUrl: https://login.microsoftonline.com/common/oauth2/v2.0/token
          scopes: { }
security:
  - azureaadv2: [ ]