Fix compatibility with Flask 2.2.x

[mcb30]

Flask 2.2.x removed the MethodViewType metaclass from which ResourceMeta currently inherits.

Fix by inheriting from type(MethodView) instead.

Fixes: #212
Fixed-by: James Wu wuyanping.08@gmail.com

[nbrinckm]

@akira-dev Just the question, if it would be possible to check this PR - as it would be really nice to be able to use more up to date flask versions.

[jondkelley]

Why hasn't the maintainer responded to this?

Seems it is still broken.

python3 app.py
Traceback (most recent call last):
  File "/Users/toor/workspace/connexion/app.py", line 4, in <module>
    from flask_rest_jsonapi import Api, ResourceDetail, ResourceList, ResourceRelationship
  File "/Users/toor/workspace/connexion/venv/lib/python3.9/site-packages/flask_rest_jsonapi/__init__.py", line 3, in <module>
    from flask_rest_jsonapi.api import Api
  File "/Users/toor/workspace/connexion/venv/lib/python3.9/site-packages/flask_rest_jsonapi/api.py", line 12, in <module>
    from flask_rest_jsonapi.resource import ResourceList, ResourceRelationship
  File "/Users/toor/workspace/connexion/venv/lib/python3.9/site-packages/flask_rest_jsonapi/resource.py", line 12, in <module>
    from flask.views import MethodView, MethodViewType
ImportError: cannot import name 'MethodViewType' from 'flask.views' (/Users/toor/workspace/connexion/venv/lib/python3.9/site-packages/flask/views.py)

blinker==1.7.0
click==8.1.7
Flask==3.0.0
Flask-REST-JSONAPI==0.31.2
greenlet==3.0.3
importlib-metadata==7.0.1
itsdangerous==2.1.2
Jinja2==3.1.3
MarkupSafe==2.1.3
marshmallow==3.20.2
marshmallow-jsonapi==0.24.0
packaging==23.2
six==1.16.0
SQLAlchemy==2.0.25
typing_extensions==4.9.0
Werkzeug==3.0.1
zipp==3.17.0

[reduzent]

Please merge this trivial, but important fix.