Add region filters, fields for circuits models

netbox/circuits/filters.py

@@ -18,6 +18,17 @@ class ProviderFilter(CustomFieldFilterSet, CreatedUpdatedFilterSet):
         method='search',
         label='Search',
     )
+    region_id = TreeNodeMultipleChoiceFilter(
+        queryset=Region.objects.all(),
+        field_name='circuits__terminations__site__region__in',
+        label='Region (ID)',
+    )
+    region = TreeNodeMultipleChoiceFilter(
+        queryset=Region.objects.all(),
+        field_name='circuits__terminations__site__region__in',
+        to_field_name='slug',
+        label='Region (slug)',
+    )
     site_id = django_filters.ModelMultipleChoiceFilter(
         field_name='circuits__terminations__site',
         queryset=Site.objects.all(),

netbox/circuits/forms.py

@@ -104,6 +104,18 @@ class ProviderFilterForm(BootstrapMixin, CustomFieldFilterForm):
         required=False,
         label='Search'
     )
+    region = FilterChoiceField(
+        queryset=Region.objects.all(),
+        to_field_name='slug',
+        required=False,
+        widget=APISelectMultiple(
+            api_url="/api/dcim/regions/",
+            value_field="slug",
+            filter_for={
+                'site': 'region'
+            }
+        )
+    )
     site = FilterChoiceField(
         queryset=Site.objects.all(),
         to_field_name='slug',