Migration Guide

Enabling warnings

To view deprecations, you may need to enable warnings within python. This can be achieved with either the -W flag, or with PYTHONWARNINGS environment variable. For example, you could run your test suite like so:

$ python -W once manage.py test

The above would print all warnings once when they first occur. This is useful to know what violations exist in your code (or occasionally in third party code). However, it only prints the last line of the stack trace. You can use the following to raise the full exception instead:

$ python -W error manage.py test

Migrating to 2.0

This release contains several changes that break forwards compatibility. This includes removed features, renamed attributes and arguments, and some reworked features. Due to the nature of these changes, it is not feasible to release a fully forwards-compatible migration release. Please review the below list of changes and update your code accordingly.

Filter.lookup_expr list form removed (#851)

The Filter.lookup_expr argument no longer accepts None or a list of expressions. Use the LookupChoiceFilter instead.

FilterSet filter_for_reverse_field removed (#915)

The filter_for_field method now generates filters for reverse relationships, removing the need for filter_for_reverse_field. As a result, reverse relationships now also obey Meta.filter_overrides.

View attributes renamed (#867)

Several view-related attributes have been renamed to improve consistency with other parts of the library. The following classes are affected:

  • DRF ViewSet.filter_class => filterset_class
  • DRF ViewSet.filter_fields => filterset_fields
  • DjangoFilterBackend.default_filter_set => filterset_base
  • DjangoFilterBackend.get_filter_class() => get_filterset_class()
  • FilterMixin.filter_fields => filterset_fields

FilterSet Meta.together option removed (#791)

The Meta.together has been deprecated in favor of userland implementations that override the clean method of the Meta.form class. An example will be provided in a “recipes” section in future docs.

FilterSet “strictness” handling moved to view (#788)

Strictness handling has been removed from the FilterSet and added to the view layer. As a result, the FILTERS_STRICTNESS setting, Meta.strict option, and strict argument for the FilterSet initializer have all been removed.

To alter strictness behavior, the appropriate view code should be overridden. More details will be provided in future docs.

Filter.name renamed to Filter.field_name (#792)

The filter name has been renamed to field_name as a way to disambiguate the filter’s attribute name on its FilterSet class from the field_name used for filtering purposes.

Filter.widget and Filter.required removed (#734)

The filter class no longer directly stores arguments passed to its form field. All arguments are located in the filter’s .extra dict.

MultiWidget replaced by SuffixedMultiWidget (#770)

RangeWidget, DateRangeWidget, and LookupTypeWidget now inherit from SuffixedMultiWidget, changing the suffixes of their query param names. For example, RangeWidget now has _min and _max suffixes instead of _0 and _1.

Migrating to 1.0

The 1.0 release of django-filter introduces several API changes and refinements that break forwards compatibility. Below is a list of deprecations and instructions on how to migrate to the 1.0 release. A forwards-compatible 0.15 release has also been created to help with migration. It is compatible with both the existing and new APIs and will raise warnings for deprecated behavior.

MethodFilter and Filter.action replaced by Filter.method (#382)

The functionality of MethodFilter and Filter.action has been merged together and replaced by the Filter.method parameter. The method parameter takes either a callable or the name of a FilterSet method. The signature now takes an additional name argument that is the name of the model field to be filtered on.

Since method is now a parameter of all filters, inputs are validated and cleaned by its field_class. The function will receive the cleaned value instead of the raw value.

# 0.x
class UserFilter(FilterSet):
    last_login = filters.MethodFilter()

    def filter_last_login(self, qs, value):
        # try to convert value to datetime, which may fail.
        if value and looks_like_a_date(value):
            value = datetime(value)

        return qs.filter(last_login=value})


# 1.0
class UserFilter(FilterSet):
    last_login = filters.CharFilter(method='filter_last_login')

    def filter_last_login(self, qs, name, value):
        return qs.filter(**{name: value})

QuerySet methods are no longer proxied (#440)

The __iter__(), __len__(), __getitem__(), count() methods are no longer proxied from the queryset. To fix this, call the methods on the .qs property itself.

f = UserFilter(request.GET, queryset=User.objects.all())

# 0.x
for obj in f:
    ...

# 1.0
for obj in f.qs:
    ...

Filters no longer autogenerated when Meta.fields is not specified (#450)

FilterSets had an undocumented behavior of autogenerating filters for all model fields when either Meta.fields was not specified or when set to None. This can lead to potentially unsafe data or schema exposure and has been deprecated in favor of explicitly setting Meta.fields to the '__all__' special value. You may also blacklist fields by setting the Meta.exclude attribute.

class UserFilter(FilterSet):
    class Meta:
        model = User
        fields = '__all__'

# or
class UserFilter(FilterSet):
    class Meta:
        model = User
        exclude = ['password']

Move FilterSet options to Meta class (#430)

Several FilterSet options have been moved to the Meta class to prevent potential conflicts with declared filter names. This includes:

  • filter_overrides
  • strict
  • order_by_field
# 0.x
class UserFilter(FilterSet):
    filter_overrides = {}
    strict = STRICTNESS.RAISE_VALIDATION_ERROR
    order_by_field = 'order'
    ...

# 1.0
class UserFilter(FilterSet):
    ...

    class Meta:
        filter_overrides = {}
        strict = STRICTNESS.RAISE_VALIDATION_ERROR
        order_by_field = 'order'

FilterSet ordering replaced by OrderingFilter (#472)

The FilterSet ordering options and methods have been deprecated and replaced by OrderingFilter. Deprecated options include:

  • Meta.order_by
  • Meta.order_by_field

These options retain backwards compatibility with the following caveats:

  • order_by asserts that Meta.fields is not using the dict syntax. This previously was undefined behavior, however the migration code is unable to support it.

  • Prior, if no ordering was specified in the request, the FilterSet implicitly filtered by the first param in the order_by option. This behavior cannot be easily emulated but can be fixed by ensuring that the passed in queryset explicitly calls .order_by().

    filterset = MyFilterSet(queryset=MyModel.objects.order_by('field'))
    

The following methods are deprecated and will raise an assertion if present on the FilterSet:

  • .get_order_by()
  • .get_ordering_field()

To fix this, simply remove the methods from your class. You can subclass OrderingFilter to migrate any custom logic.

Deprecated FILTERS_HELP_TEXT_FILTER and FILTERS_HELP_TEXT_EXCLUDE (#437)

Generated filter labels in 1.0 will be more descriptive, including humanized text about the lookup being performed and if the filter is an exclusion filter.

These settings will no longer have an effect and will be removed in the 1.0 release.

DRF filter backend raises TemplateDoesNotExist exception (#562)

Templates are now provided by django-filter. If you are receiving this error, you may need to add 'django_filters' to your INSTALLED_APPS setting. Alternatively, you could provide your own templates.