[BUG][GO] Syntactically wrong client code generated when uses one of taking param and list of param

[vikashsparky]

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• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

Model generated for schema which takes one of object and array of object, does not compile. []Link in below code is not valid variable name.

// Link struct for Link
type Link struct {
        Href *string `json:"href,omitempty"`
}

// LinksValueSchema - struct for LinksValueSchema
type LinksValueSchema struct {
        Link *Link
        []Link *[]Link
}

openapi-generator version

3.0

OpenAPI declaration file content or url

openapi: 3.0.0

info:
  version: '1.1.2'
  title: 'Test Service'
  description: |
    Test Service.

servers:
  - url: '{apiRoot}/nfm/v1'
    variables:
      apiRoot:
        default: https://example.com

paths:
  /nf-instances:
    get:
      summary: Retrieves a collection of Instances
      operationId: GetInstances
      tags:
        - Instances (Store)
      parameters:
        - name: limit
          in: query
          description: How many items to return at one time
          required: false
          schema:
            type: integer
      responses:
        '200':
          description: Expected response to a valid request
          content:
            application/3gppHal+json:
              schema:
                type: object
                properties:
                  _links:
                    type: object
                    description: 'List of the URI of instances. It has two members whose names are item and self.
                    additionalProperties:
                      $ref: '#/components/schemas/LinksValueSchema'
                minProperties: 1

components:
  schemas:
    Link:
      type: object
      properties:
        href:
          type: string
    LinksValueSchema:
      oneOf:
        - type: array
          items:
            $ref: '#/components/schemas/Link'
          minItems: 1
        - $ref: '#/components/schemas/Link'

Generation Details

Steps to reproduce

~/bin/openapitools/openapi-generator-cli generate -g go -o ~/test_dir/ -i test.yaml

Related issues/PRs

Suggest a fix

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[willh99]

We are seeing this issue as well as other syntactically wrong generation for the Go client. Examples:

components:
  schemas: 
   TestModel:
      properties:
        prop1:
          additionalProperties:
            anyOf:
            - {}
            - $ref: '#/components/schemas/OtherModel'
          type: object
      title: TestModel
      type: object

Results in the following struct:

type TestModel struct {
	OtherModel *OtherModel
	interface{} *interface{}
}

And the following response:

  /v1/thing/{thing_id}/start:
    post:
     ...
     requestBody:
     ...
      responses:
        '200':
          content:
            application/json:
              schema:
                anyOf:
                - $ref: '#/components/schemas/StartResponse'
                - type: object

Results in the model:

type ResponseThingStartPost struct {
	StartResponse *StartResponse
	map[string]interface{} *map[string]interface{}
}

These all seem to be constrained to the model_anyof.mustache template which is adding types as field names:

// {{classname}} {{{description}}}{{^description}}struct for {{{classname}}}{{/description}}
type {{classname}} struct {
	{{#anyOf}}
	{{{.}}} *{{{.}}}
	{{/anyOf}}
}