Implemented dynamic filters for custom fields

netbox/extras/filters.py

@@ -0,0 +1,31 @@
+import django_filters
+
+from django.contrib.contenttypes.models import ContentType
+
+from .models import CustomField
+
+
+class CustomFieldFilter(django_filters.Filter):
+    """
+    Filter objects by the presence of a CustomFieldValue. The filter's name is used as the CustomField name.
+    """
+
+    def filter(self, queryset, value):
+        return queryset.filter(
+            custom_field_values__field__name=self.name,
+            custom_field_values__serialized_value=value,
+        )
+
+
+class CustomFieldFilterSet(django_filters.FilterSet):
+    """
+    Dynamically add a Filter for each CustomField applicable to the parent model.
+    """
+
+    def __init__(self, *args, **kwargs):
+        super(CustomFieldFilterSet, self).__init__(*args, **kwargs)
+
+        obj_type = ContentType.objects.get_for_model(self._meta.model)
+        custom_fields = CustomField.objects.filter(obj_type=obj_type)
+        for cf in custom_fields:
+            self.filters['cf_{}'.format(cf.name)] = CustomFieldFilter(name=cf.name)