Fix: Flask 2.2 'MethodViewType' Removal

[0x78f1935]

Fixes: #384

Traceback (most recent call last):
  File "/var/lib/jenkins/workspace/development/development/tests/dist/webserver.py", line 9, in <module>
    from backend import Webserver
  File "/var/lib/jenkins/workspace/development/development/tests/dist/backend/__init__.py", line 15, in <module>
    from backend.extensions import init_app as _init_extensions
  File "/var/lib/jenkins/workspace/development/development/tests/dist/backend/extensions/__init__.py", line 9, in <module>
    from flask_smorest import Api  # noqa: E402
  File "/var/lib/jenkins/workspace/development/.pyenv-python3/lib/python3.9/site-packages/flask_smorest/__init__.py", line 6, in <module>
    from .blueprint import Blueprint  # noqa
  File "/var/lib/jenkins/workspace/development/.pyenv-python3/lib/python3.9/site-packages/flask_smorest/blueprint.py", line 46, in <module>
    from flask.views import MethodViewType
ImportError: cannot import name 'MethodViewType' from 'flask.views'

Same issue flask_apispec has
Fix inspired by this topic.
Might fix #386 PR too.

[lafrech]

Thanks. Currently AFK. Will look into this when back from holidays.

[codecov]

Codecov Report

Merging #387 (82859f8) into master (fb94390) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #387   +/-   ##
=======================================
  Coverage   99.87%   99.87%           
=======================================
  Files          13       13           
  Lines         819      819           
  Branches      179      179           
=======================================
  Hits          818      818           
  Partials        1        1           

Impacted Files	Coverage Δ
flask_smorest/blueprint.py	100.00% <100.00%> (ø)

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[lafrech]

For the record, same fix was applied to apiflask.

Thanks.

[AbdealiLoKo]

Hi, is there a plan to publish this on pypi ?

[lafrech]

See #384 (comment).

I need to fix other Flask 2.2 issues first (work in progress).