django-rest-framework/rest_framework/checks.py

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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. "
"If you wish to define PAGE_SIZE globally whilst defining "
"pagination_class on a per-view basis you may silence this check.",
id="rest_framework.W001"
)
)
return errors