3.15 missing package inflection

[robd003]

New issue in the 3.15 release where if you use generateschema and have a list in your output you will get a ModuleNotFound error.

 > [19/21] RUN poetry run python manage.py generateschema --file /code/templates/openapi-schema.yml:                                                                                                                                                                                                                                                                   
2.585 Traceback (most recent call last):                                                                                                                                                                                                                                                                                                                                                                                                 
2.586   File "/code/manage.py", line 22, in <module>                                                                                                                                                                                                                                                                                                                                                                                     
2.587     main()                                                                                                                                                                                                                                                                                                                                                                                                                         
2.588   File "/code/manage.py", line 18, in main                                                                                                                                                                                                                                                                                                                                                                                         
2.589     execute_from_command_line(sys.argv)
2.590   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
2.590     utility.execute()
2.591   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/django/core/management/__init__.py", line 436, in execute
2.592     self.fetch_command(subcommand).run_from_argv(self.argv)
2.593   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/django/core/management/base.py", line 412, in run_from_argv
2.593     self.execute(*args, **cmd_options)
2.594   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/django/core/management/base.py", line 458, in execute
2.595     output = self.handle(*args, **options)
2.596              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2.600   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/rest_framework/management/commands/generateschema.py", line 43, in handle
2.601     schema = generator.get_schema(request=None, public=True)
2.602              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2.606   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/rest_framework/schemas/openapi.py", line 80, in get_schema
2.608     operation = view.schema.get_operation(path, method)
2.608                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2.608   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/rest_framework/schemas/openapi.py", line 146, in get_operation
2.608     operation['operationId'] = self.get_operation_id(path, method)
2.608                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2.608   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/rest_framework/schemas/openapi.py", line 268, in get_operation_id
2.608     name = self.get_operation_id_base(path, method, action)
2.608            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2.608   File "/root/.cache/pypoetry/virtualenvs/allfactors-django-MATOk_fk-py3.12/lib/python3.12/site-packages/rest_framework/schemas/openapi.py", line 250, in get_operation_id_base
2.608     from inflection import pluralize
2.608 ModuleNotFoundError: No module named 'inflection'

[tomchristie]

Ah yep, needs resolving.

Introduced by PR #8017.

Ooptions...

• Revert the PR. (Marginally incorrect naming is better than broken behavior)
• Add the dependency

[robd003]

I vote for including the dependency

One other idea:

try:
    from inflection import pluralize
except ImportError:
    def pluralize(input):
        if not input.endswith('s'):
            input += "s"

[tfranzel]

I took the liberty to opt for a third option, i.e handling it analog to uritemplate. That is another optional package that needs to be installed for using the built-in generator. Both packages are listed as optional, but need to be explicitly installed for schema generation. This will still fail, but with a better error message.

We updated the docs to reflect that requirement though.

@robd003 Also note that the built-in schema generator is deprecated. I would recommend to use one of the 3rd party alternatives instead.

Imho the proper way would be to introduce djangorestframework[openapi], but seems like overkill given that all this is deprecated anyway.