[BUG] [Typescript] Application/JSON query parameter not serialized correctly

[gbertoncelli]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used? 4.3.0
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

I'm trying to generate the SDK with this endpoint definition:

  '/entities/{id}/secondentities':
    get:
      operationId: getSecondEntitiesByEntities
      tags:
        - channels
      parameters:
        - in: path
          name: id
          schema:
            type: integer
          required: true
        - $ref: '#/components/parameters/problematicParameter'
      responses:
        '200':
          $ref: '#/components/responses/data200'
        '404':
          description: Not found
        '500':
          description: Internal server error

and the parameter is described as a content/application-json complex object that should be serialized in the query string:

    problematicParameter:
      in: query
      required: false
      name: filter
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/problematicParameterSchema'

The schema is something like this:

    problematicParameterSchema:
      type: object
      properties:
        tags:
          type: array
          items:
            type: string
        attributes:
          type: array
          items:
            type: string

The generated typescript code has a signature like this:

    public getSecondEntitiesByEntities(id: number, filter?: ProblematicParameterSchema, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/json'}): Observable<Array<PlacemarkData>>;

The model of ProblematicParameter is correctly generated, but when I call this function with a valid object of type ProblematicParameterSchema the URL is not generated correctly.

For example with:

getSecondEntitiesByEntities(1, {attributes: ['c', 'd'], tags: ['a', 'b']})

the generated URL is:

API_BASE/entities/{id}/secondentities?attributes="c"&attributes="d"&tags="a"&tags="b"

completely ignoring the name filter of the parameter.
The expected result should be something like this:

API_BASE/entities/{id}/secondentities?filter='{"attributes": ["c", "d"], "tags": ["a", "b"]}'

openapi-generator version

4.3.0

OpenAPI declaration file content or url

Command line used for generation

openapi-generator generate -i oas3.json -o sdk -g typescript-angular

Steps to reproduce

1. Create the schema described above
2. Create the parameter described above
3. Run

Related issues/PRs

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[clcii]

Having same issue with filter applied to root entity.
Expecting ansi encoded [baseurl]/entity?filter={limit:100,skip:0}
Actually receiving [baseurl]/entity?limit=100&skip=0

Generated from ...

  	"get": {
  		"x-controller-name": "EntitysController",
  		"x-operation-name": "find",
  		"tags": [
  			"EntitysController"
  		],
  		"responses": {
  			"200": {
  				"description": "Array of Entity model instances",
  				"content": {
  					"application/json": {
  						"schema": {
  							"type": "array",
  							"items": {
  								"$ref": "#/components/schemas/EntityWithRelations"
  							}
  						}
  					}
  				}
  			}
  		},
  		"parameters": [
  			{
  				"name": "filter",
  				"in": "query",
  				"content": {
  					"application/json": {
  						"schema": {
  							"$ref": "#/components/schemas/Entity.Filter1"
  						}
  					}
  				}
  			}
  		],
  		"operationId": "EntitysController.find"
  	}
  }

},
"servers": [
{
"url": "http://[::1]:3000"
}
]

[thecodrr]

This issue is still present.