[BUG][NodeJS-Express-Server ReferenceRequestBodies are not parsed by the controller

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• [5] What's the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

The NodeJS Express Server generator controller.js does not process reference request bodies. Is there are a way to make it do so?

openapi-generator version

5

OpenAPI declaration file content or url

   post:
      operationId: organisationsOrganisationIdAuthorisationserversPOST
      parameters:
      - description: The organisation ID
        explode: false
        in: path
        name: OrganisationId
        required: true
        schema:
          $ref: '#/components/schemas/OrganisationId'
        style: simple
      requestBody:
        $ref: '#/components/requestBodies/AuthorisationServerRequest'
      responses:
        "201":
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AuthorisationServer'
          description: Authorisation server response
        "400":
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BadRequest'
          description: Bad Request
        "401":
          description: Unauthorized
        "404":
          description: Not found
        "406":
          description: Not Acceptable
        "500":
          description: Internal Server Error
        "502":
          description: Bad Gateway
      security:
      - authorizer: []
      summary: Create an Authorisation Server for the given organisation
      tags:
      - Authorisation Servers
      x-eov-operation-handler: controllers/AuthorisationServersController

Command line used for generation

OPENAPI_GENERATOR_VERSION=5.0.0-SNAPSHOT openapi-generator-cli generate -i /TrustFramework.yaml -o ./output -g nodejs-express-server

Steps to reproduce

1. Generate the server.
2. Test that GETs function correctly.
3. Post's fail to process throwing an undefined exception in Controller.js collectRequestParams() const { content } = request.openapi.schema.requestBody; as content is undefined whent the requestbody is a reference.

Related issues/PRs

Suggest a fix

Can reference request bodies be handled

Start with the generated controller.js collectRequestParams() path described in the report and reproduce the issue using the provided OpenAPI declaration and generation command. Trace how request.openapi.schema.requestBody is populated when requestBody uses a reference. Done means POST requests process reference request bodies without an undefined content error.