Use TreeNode choice fields for region assignment

netbox/dcim/forms.py

@@ -182,18 +182,18 @@ class MACAddressField(forms.Field):
 #
 
 class RegionForm(BootstrapMixin, forms.ModelForm):
+    parent = TreeNodeChoiceField(
+        queryset=Region.objects.all(),
+        required=False,
+        widget=StaticSelect2()
+    )
     slug = SlugField()
 
     class Meta:
         model = Region
-        fields = [
+        fields = (
             'parent', 'name', 'slug',
-        ]
-        widgets = {
-            'parent': APISelect(
-                api_url="/api/dcim/regions/"
         )
-        }
 
 
 class RegionCSVForm(forms.ModelForm):
@@ -232,9 +232,7 @@ class SiteForm(BootstrapMixin, TenancyForm, CustomFieldModelForm):
     region = TreeNodeChoiceField(
         queryset=Region.objects.all(),
         required=False,
-        widget=APISelect(
-            api_url="/api/dcim/regions/"
-        )
+        widget=StaticSelect2()
     )
     slug = SlugField()
     comments = CommentField()
@@ -325,9 +323,7 @@ class SiteBulkEditForm(BootstrapMixin, AddRemoveTagsForm, CustomFieldBulkEditFor
     region = TreeNodeChoiceField(
         queryset=Region.objects.all(),
         required=False,
-        widget=APISelect(
-            api_url="/api/dcim/regions/"
-        )
+        widget=StaticSelect2()
     )
     tenant = forms.ModelChoiceField(
         queryset=Tenant.objects.all(),

netbox/extras/forms.py

@@ -1,6 +1,7 @@
 from django import forms
 from django.contrib.auth.models import User
 from django.contrib.contenttypes.models import ContentType
+from mptt.forms import TreeNodeMultipleChoiceField
 from taggit.forms import TagField
 
 from dcim.models import DeviceRole, Platform, Region, Site
@@ -8,7 +9,7 @@ from tenancy.models import Tenant, TenantGroup
 from utilities.forms import (
     add_blank_choice, APISelectMultiple, BootstrapMixin, BulkEditForm, BulkEditNullBooleanSelect, ColorSelect,
     CommentField, ContentTypeSelect, DateTimePicker, DynamicModelMultipleChoiceField, JSONField, SlugField,
-    StaticSelect2, BOOLEAN_WITH_BLANK_CHOICES,
+    StaticSelect2, StaticSelect2Multiple, BOOLEAN_WITH_BLANK_CHOICES,
 )
 from virtualization.models import Cluster, ClusterGroup
 from .choices import *
@@ -190,6 +191,11 @@ class TagBulkEditForm(BootstrapMixin, BulkEditForm):
 #
 
 class ConfigContextForm(BootstrapMixin, forms.ModelForm):
+    regions = TreeNodeMultipleChoiceField(
+        queryset=Region.objects.all(),
+        required=False,
+        widget=StaticSelect2Multiple()
+    )
     tags = forms.ModelMultipleChoiceField(
         queryset=Tag.objects.all(),
         to_field_name='slug',