[Golang][client] undefined optional error in generated go code

[anandshah05]

Description

The generated go code for the yaml file, contains optional struck but missing optional import statement

openapi-generator version

3.2.0
same issue on master

OpenAPI declaration file content or url

auth.yaml

openapi: 3.0.0
info:
  version: 1.0
  title: AUTH API
paths:
  /ue-authentications/{authCtxId}/eap-session:
    post:
      operationId: EapAkaPrime
      parameters:
        - name: authCtxId
          in: path
          required: true
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EapSession'
      responses:
        '200':
          description: Use to handle or close the EAP session
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EapSession'
            application/3gppHal+json:
              schema:
                type: object
                properties:
                  eapPayload:
                    $ref: '#/components/schemas/EapPayload'
                required:
                  - eapPayload
                  - _links
components:
  schemas:
    EapSession:
      type: object
      properties:
        eapPayload:
          $ref: '#/components/schemas/EapPayload'
        kSeaf:
          $ref: '#/components/schemas/Kseaf'
      required:
        - eapPayload
    AuthResult:
      type: string
      enum:
        - AUTHENTICATION_SUCCESS
        - AUTHENTICATION_FAILURE
        - AUTHENTICATION_ONGOING
    EapPayload:
      type: string
      format: base64
      description: contains an EAP packet
    Kseaf:
      type: string
      pattern: '[A-Fa-f0-9]{64}'
    ResStar:
      type: string
      pattern: '[A-Fa-f0-9]{32}'
    HxresStar:
      type: string
      pattern: '[A-Fa-f0-9]{32}'
    AuthType:
      type: string
      enum:
        - 5G_AKA
        - EAP_AKA_PRIME

Command line used for generation

generate -g go -i auth.yaml -o generated/go

Steps to reproduce

Generated code using above yaml and it will generate go code with import missing

Suggest a fix/enhancement

In AbstractGoCodegen.java - it seems, import is added only for primitives

• // import "optionals" package if the parameter is primitive and optional
• if (!param.required && param.isPrimitiveType) {

• // import "optionals" package if the parameter is optional
• if (!param.required) {

[axl89]

I faced this same issues with the latest 3.X version.