[BUG][cpp-restsdk] key-type of a map is hardcoded to utility::string_t

[gjvdbraak]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• 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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The cpp-restsdk generator always uses utility::string_t as the type of the key in an std::map, even if a different type-mapping is given.

openapi-generator version

v7.20.0

OpenAPI declaration file content or url

openapi: 3.1.0
info:
  title: Example
  description: Example
  version: 1.0.0

components:
  schemas:
    Pet:
      type: object
      properties:
        name:
          type: string
        age:
          type: integer
      required: [ name, age ]

    PetCollection:
      type: object
      properties:
        collectionName:
          type: string
        owners:
          type: array
          items:
            type: string
        pets:
          type: object
          additionalProperties:
            $ref: "#/components/schemas/Pet"
      required: [collectionName, owners, pets]

Generation Details

java -jar openapi-generator-cli-7.20.0.jar generate -i openapi.yaml -g cpp-restsdk -o petstore --type-mappings string=std::string

Steps to reproduce

1. Generate C++ code as described above
2. Check type of m_Pets in PetCollection.h

The current result is
std::map<utility::string_t, std::shared_ptr<Pet>> m_Pets;
while the expected outcome is
std::map<std::string, std::shared_ptr<Pet>> m_Pets;

Note that the type-mapping for m_CollectionName and m_Owners is correct and uses the provided std::string.

Related issues/PRs

-

Suggest a fix

It looks like utility::string_t is hardcoded in https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CppRestSdkClientCodegen.java#L466

Probably utility::string_t on this line has to be changed to getSchemaType("string")