[BUG][PYTHON] Int Enum serialization is the enum name instead of value

[BaptisteSaves]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• 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

When using Enum as a parameter, the serialization is the enum name instead of the value. Enum.NUMBER_0 instead of 0

openapi-generator version

v7.4.0

OpenAPI declaration file content or url

openapi: 3.1.0
info:
  title: Sample API
  version: 1.0.0
paths:
  /path:
    get:
      parameters:
        - in: query
          name: param
          schema:
            type: array
            items:
              $ref: '#/components/schemas/AnEnum'
      responses:
        200:
          description: Ok
components:
  schemas:
    AnEnum:
      type: integer
      enum:
        - 0
        - 1

Generation Details

Simple generation in 7.4.0 with -g python

Steps to reproduce

This code currently fails

import unittest
from openapi_client import DefaultApi, AnEnum

class TestIssue(unittest.TestCase):

    def test_issue_enum(self):
        assert DefaultApi()._path_get_serialize([AnEnum.NUMBER_0], None,None,None, 0)[1] == '/api/issueX?param=0'

Suggest a fix

https://github.com/OpenAPITools/openapi-generator/blob/f323a3e788ec932ddc1e31f44f3bd0c8a88f7dbc/modules/openapi-generator/src/main/resources/python/api_client.mustache#L355C25-L355C28 Before testing for primitive types, test for Enum and return obj.value

In Python, the object is both primitive and enum

--> will push a PR with this fix