The Client Generated from Swagger Codegen doesn't work when you pass complex object in the query parameter

The Client Generated from Swagger Codegen doesn't work when you pass complex object in the query parameter

3.0.9

Swagger declaration file content or url

Command line used for generation

Steps to reproduce

My API takes an Object in the query param.

• name: q_client_params
  in: query
  description: Additional parameters for client request
  required: false
  style: deepObject
  explode: true
  schema:
  $ref: '#/components/schemas/client_request'

SCHEMA:-
client_request:
type: object
properties:
includ_profile_details:
type: boolean
default: false
include_client_xref:
type: boolean
default: false

When the model classes are generated it appends this "class ClientRequest" which creates problem while genrating the url.

@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("class ClientRequest {\n");

sb.append("    includProfileDetails: ").append(toIndentedString(includProfileDetails)).append("\n");
sb.append("    includeClientXref: ").append(toIndentedString(includeClientXref)).append("\n");
sb.append("}");
return sb.toString();

}

ideally my URL should be
/client/?q_language=EN&q_client_params={“includ_profile_details”:true,”include_client_xref”:true”}

HOWEVER the code is generating something like this
/client/?q_language=EN&q_client_params=class+ClientRequest+{
includProfileDetails: true
includeClientXref: true
}

As the codegen appends this extra string like "class+ClientRequest+" the API call fails.
The Invocation.Builder is not able to build.

Related issues/PRs

Suggest a fix/enhancement

No source file, generator command, or test is named. Start by reproducing the generated Java client's handling of the deepObject query parameter and inspect how the ClientRequest model is converted before Invocation.Builder constructs the URL. Done means the request uses the expected object query representation without the class name or toString formatting.