From f41f14113039b9bd0434bba03b8ca02507827178 Mon Sep 17 00:00:00 2001
From: Jeremy Stretch <jstretch@digitalocean.com>
Date: Tue, 6 Nov 2018 15:32:38 -0500
Subject: [PATCH] Removed unused class NullableModelMultipleChoiceField

---
 netbox/utilities/filters.py | 47 -------------------------------------
 1 file changed, 47 deletions(-)

diff --git a/netbox/utilities/filters.py b/netbox/utilities/filters.py
index 1fb048db4..18161d465 100644
--- a/netbox/utilities/filters.py
+++ b/netbox/utilities/filters.py
@@ -1,14 +1,6 @@
-import itertools
-
 import django_filters
-from django import forms
-from django.utils.encoding import force_text
 
 
-#
-# Filters
-#
-
 class NumericInFilter(django_filters.BaseInFilter, django_filters.NumberFilter):
     """
     Filters for a set of numeric values. Example: id__in=100,200,300
@@ -27,42 +19,3 @@ class NullableCharFieldFilter(django_filters.CharFilter):
             return super(NullableCharFieldFilter, self).filter(qs, value)
         qs = self.get_method(qs)(**{'{}__isnull'.format(self.name): True})
         return qs.distinct() if self.distinct else qs
-
-
-class NullableModelMultipleChoiceField(forms.ModelMultipleChoiceField):
-    """
-    This field operates like a normal ModelMultipleChoiceField except that it allows for one additional choice which is
-    used to represent a value of Null. This is accomplished by creating a new iterator which first yields the null
-    choice before entering the queryset iterator, and by ignoring the null choice during cleaning. The effect is similar
-    to defining a MultipleChoiceField with:
-
-        choices = [(0, 'None')] + [(x.id, x) for x in Foo.objects.all()]
-
-    However, the above approach forces immediate evaluation of the queryset, which can cause issues when calculating
-    database migrations.
-    """
-    iterator = forms.models.ModelChoiceIterator
-
-    def __init__(self, null_value=0, null_label='-- None --', *args, **kwargs):
-        self.null_value = null_value
-        self.null_label = null_label
-        super(NullableModelMultipleChoiceField, self).__init__(*args, **kwargs)
-
-    def _get_choices(self):
-        if hasattr(self, '_choices'):
-            return self._choices
-        # Prepend the null choice to the queryset iterator
-        return itertools.chain(
-            [(self.null_value, self.null_label)],
-            self.iterator(self),
-        )
-    choices = property(_get_choices, forms.ChoiceField._set_choices)
-
-    def clean(self, value):
-        # Strip all instances of the null value before cleaning
-        if value is not None:
-            stripped_value = [x for x in value if x != force_text(self.null_value)]
-        else:
-            stripped_value = value
-        super(NullableModelMultipleChoiceField, self).clean(stripped_value)
-        return value