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Add friendly error message when django-filter isn't installed

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This commit is contained in:
Kieran Spear 2016-10-25 10:25:01 +08:00
parent 96523b6883
commit f4409fd258
1 changed files with 13 additions and 2 deletions
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15
rest_framework/filters.py
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@ -49,9 +49,20 @@ if django_filters:
PendingDeprecationWarning
)
return super(FilterSetMetaclass, cls).__new__(cls, name, bases, attrs)
_BaseFilterSet = DFFilterSet
else:
# Dummy metaclass just so we can give a user-friendly error message.
class FilterSetMetaclass(type):
def __init__(self, name, bases, attrs):
# Assert only on subclasses, so we can define FilterSet below.
if bases != (object,):
assert False, 'django-filter must be installed to use the `FilterSet` class'
super(FilterSetMetaclass, self).__init__(name, bases, attrs)
_BaseFilterSet = object
class FilterSet(six.with_metaclass(FilterSetMetaclass, DFFilterSet)):
pass
class FilterSet(six.with_metaclass(FilterSetMetaclass, _BaseFilterSet)):
pass
class DjangoFilterBackend(BaseFilterBackend):