django-rest-framework/rest_framework/checks.py
Matt Davis 107e8b3d23 Make DEFAULT_PAGINATION_CLASS None by default. (#5170)
* Changes to the paginator defaults and settings

Require a default paginator be specified when using the page size
setting.
https://github.com/encode/django-rest-framework/issues/5168

* DRF-5168 import warnings

missed this in last commit

* Add a system checks file

Add a check for pagination settings for the 3.7 upgrade cycle.

* more compatible import approach

* missing bactic

* revised language and approach to import the system check

Adds a rest framework app config.

* Adjust doc wording
2017-09-25 15:36:30 +02:00

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Python

from django.core.checks import Tags, Warning, register
@register(Tags.compatibility)
def pagination_system_check(app_configs, **kwargs):
errors = []
# Use of default page size setting requires a default Paginator class
from rest_framework.settings import api_settings
if api_settings.PAGE_SIZE and not api_settings.DEFAULT_PAGINATION_CLASS:
errors.append(
Warning(
"You have specified a default PAGE_SIZE pagination rest_framework setting,"
"without specifying also a DEFAULT_PAGINATION_CLASS.",
hint="The default for DEFAULT_PAGINATION_CLASS is None. "
"In previous versions this was PageNumberPagination",
)
)
return errors