Sometimes we want to get a queryset or 404, for example, if we're passing our queryset to a subclassed generic view. This is identical to get_list_or_404 but returns a queryset.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | from django.http import Http404
from django.db.models.manager import Manager
# Identical to get_list_or_404
# but returns a queryset for use in generic views
def get_queryset_or_404(klass, *args, **kwargs):
if isinstance(klass, Manager):
manager = klass
else:
manager = klass._default_manager
queryset = manager.filter(*args, **kwargs)
if not queryset:
raise Http404('No %s matches the given query.' %
manager.model._meta.object_name)
return queryset
|
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