Many-to-many relationship specification doesn't work

[al3ad]

Using OpenAPI generator 7.1.0 I attempted to generate the YAML spec provided on the tutorial.

However, when I do that I get the following error:

Traceback (most recent call last):
  File "/usr/src/app/./openapi_server/__main__.py", line 29, in <module>
    app = create_app(app_config)
  File "/usr/src/app/./openapi_server/__init__.py", line 45, in create_app
    init_yaml(spec_file, base=SQLALCHEMY_DB.Model, models_filename=models_filename)
  File "/usr/local/lib/python3.8/dist-packages/open_alchemy/__init__.py", line 206, in init_yaml
    return _init_optional_base(
  File "/usr/local/lib/python3.8/dist-packages/open_alchemy/__init__.py", line 122, in _init_optional_base
    init_model_factory(
  File "/usr/local/lib/python3.8/dist-packages/open_alchemy/__init__.py", line 67, in init_model_factory
    _schemas_module.process(schemas=schemas, spec_filename=spec_path)
  File "/usr/local/lib/python3.8/dist-packages/open_alchemy/schemas/__init__.py", line 25, in process
    validation.process(schemas=schemas, spec_filename=spec_filename)
  File "/usr/local/lib/python3.8/dist-packages/open_alchemy/schemas/validation/__init__.py", line 130, in process
    raise _exceptions.MalformedSchemaError(other_results_result.reason)
open_alchemy.exceptions.MalformedSchemaError: duplicate "x-tablename" value project defined on the schema Employee_projects_inner, already defined on the schema Project      
unable to load app 0 (mountpoint='/') (callable not found or import error)

I'm not sure if the problem is with my setup or with openAlchemy?

Here's the YAML spec for convenience:

openapi: "3.0.0"

info:
  title: Test Schema
  description: API to illustrate Many to Many Relationships.
  version: "0.1"

paths:
  /project:
    get:
      summary: Used to retrieve all projects.
      responses:
        200:
          description: Return all projects from the database.
          content:
            application/json:
              schema:
                type: array
                items:
                  "$ref": "#/components/schemas/Project"
  /employee:
    get:
      summary: Used to retrieve all employees.
      responses:
        200:
          description: Return all employees from the database.
          content:
            application/json:
              schema:
                type: array
                items:
                  "$ref": "#/components/schemas/Employee"

components:
  schemas:
    Project:
      description: A large sized business objective.
      type: object
      x-tablename: project
      properties:
        id:
          type: integer
          description: Unique identifier for the project.
          example: 0
          x-primary-key: true
        name:
          type: string
          description: The name of the project.
          example: Expand to the USA
    Employee:
      description: Person that works for a company.
      type: object
      x-tablename: employee
      properties:
        id:
          type: integer
          description: Unique identifier for the employee.
          example: 0
          x-primary-key: true
        name:
          type: string
          description: The name of the employee.
          example: David Andersson
        projects:
          type: array
          items:
            allOf:
              - "$ref": "#/components/schemas/Project"
              - x-secondary: employee_project
          description: The projects the employee is working on.