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get_queryset_or_404

Author:
mattpdx
Posted:
May 3, 2008
Language:
Python
Version:
.96
Score:
1 (after 1 ratings)

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.

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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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