Fixes #1649: Correct fitlering on null values (e.g. ?tenant_id=0) for django-filters v1.1.0+

netbox/utilities/filters.py

@@ -4,7 +4,6 @@ import django_filters
 import itertools
 
 from django import forms
-from django.db.models import Q
 from django.utils.encoding import force_text
 
 
@@ -66,51 +65,3 @@ class NullableModelMultipleChoiceField(forms.ModelMultipleChoiceField):
             stripped_value = value
         super(NullableModelMultipleChoiceField, self).clean(stripped_value)
         return value
-
-
-class NullableModelMultipleChoiceFilter(django_filters.ModelMultipleChoiceFilter):
-    """
-    This class extends ModelMultipleChoiceFilter to accept an additional value which implies "is null". The default
-    queryset filter argument is:
-
-        .filter(fieldname=value)
-
-    When filtering by the value representing "is null" ('0' by default) the argument is modified to:
-
-        .filter(fieldname__isnull=True)
-    """
-    field_class = NullableModelMultipleChoiceField
-
-    def __init__(self, *args, **kwargs):
-        self.null_value = kwargs.get('null_value', 0)
-        super(NullableModelMultipleChoiceFilter, self).__init__(*args, **kwargs)
-
-    def filter(self, qs, value):
-        value = value or ()  # Make sure we have an iterable
-
-        if self.is_noop(qs, value):
-            return qs
-
-        # Even though not a noop, no point filtering if empty
-        if not value:
-            return qs
-
-        q = Q()
-        for v in set(value):
-            # Filtering by "is null"
-            if v == force_text(self.null_value):
-                arg = {'{}__isnull'.format(self.name): True}
-            # Filtering by a related field (e.g. slug)
-            elif self.field.to_field_name is not None:
-                arg = {'{}__{}'.format(self.name, self.field.to_field_name): v}
-            # Filtering by primary key (default)
-            else:
-                arg = {self.name: v}
-            if self.conjoined:
-                qs = self.get_method(qs)(**arg)
-            else:
-                q |= Q(**arg)
-        if self.distinct:
-            return self.get_method(qs)(q).distinct()
-
-        return self.get_method(qs)(q)