Refs #9602 -- Moved AlreadyRegistered/NotRegistered exceptions to django.contrib.admin.exceptions.

6 files changed, 17 insertions, 19 deletions

diff --git a/django/contrib/admin/checks.py b/django/contrib/admin/checks.py
index f5aa9b55d4..1665023434 100644
--- a/django/contrib/admin/checks.py
+++ b/django/contrib/admin/checks.py
@@ -3,6 +3,7 @@ from itertools import chain
 
 from django.apps import apps
 from django.conf import settings
+from django.contrib.admin.exceptions import NotRegistered
 from django.contrib.admin.utils import NotRelationField, flatten, get_fields_from_path
 from django.core import checks
 from django.core.exceptions import FieldDoesNotExist
@@ -220,8 +221,6 @@ class BaseModelAdminChecks:
         ManyToManyField and that the item has a related ModelAdmin with
         search_fields defined.
         """
-        from django.contrib.admin.sites import NotRegistered
-
         try:
             field = obj.model._meta.get_field(field_name)
         except FieldDoesNotExist:
diff --git a/django/contrib/admin/exceptions.py b/django/contrib/admin/exceptions.py
index 2ee8f625ca..6105eef424 100644
--- a/django/contrib/admin/exceptions.py
+++ b/django/contrib/admin/exceptions.py
@@ -11,3 +11,15 @@ class DisallowedModelAdminToField(SuspiciousOperation):
     """Invalid to_field was passed to admin view via URL query string"""
 
     pass
+
+
+class AlreadyRegistered(Exception):
+    """The model is already registered."""
+
+    pass
+
+
+class NotRegistered(Exception):
+    """The model is not registered."""
+
+    pass
diff --git a/django/contrib/admin/filters.py b/django/contrib/admin/filters.py
index 197d39bf21..06dedf8727 100644
--- a/django/contrib/admin/filters.py
+++ b/django/contrib/admin/filters.py
@@ -7,6 +7,7 @@ certain test -- e.g. being a DateField or ForeignKey.
 """
 import datetime
 
+from django.contrib.admin.exceptions import NotRegistered
 from django.contrib.admin.options import IncorrectLookupParameters
 from django.contrib.admin.utils import (
     build_q_object_from_lookup_parameters,
@@ -257,8 +258,6 @@ class RelatedFieldListFilter(FieldListFilter):
         """
         Return the model admin's ordering for related field, if provided.
         """
-        from django.contrib.admin.sites import NotRegistered
-
         try:
             related_admin = model_admin.admin_site.get_model_admin(
                 field.remote_field.model
diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index f9760664dd..61ec0a638d 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -14,7 +14,7 @@ from django.contrib.admin.checks import (
     InlineModelAdminChecks,
     ModelAdminChecks,
 )
-from django.contrib.admin.exceptions import DisallowedModelAdminToField
+from django.contrib.admin.exceptions import DisallowedModelAdminToField, NotRegistered
 from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
 from django.contrib.admin.utils import (
     NestedObjects,
@@ -160,8 +160,6 @@ class BaseModelAdmin(metaclass=forms.MediaDefiningClass):
 
         If kwargs are given, they're passed to the form Field's constructor.
         """
-        from django.contrib.admin.sites import NotRegistered
-
         # If the field specifies choices, we don't need to look for special
         # admin widgets - we just need to use a select widget of some kind.
         if db_field.choices:
@@ -252,8 +250,6 @@ class BaseModelAdmin(metaclass=forms.MediaDefiningClass):
         ordering.  Otherwise don't specify the queryset, let the field decide
         (return None in that case).
         """
-        from django.contrib.admin.sites import NotRegistered
-
         try:
             related_admin = self.admin_site.get_model_admin(db_field.remote_field.model)
         except NotRegistered:
diff --git a/django/contrib/admin/sites.py b/django/contrib/admin/sites.py
index 41ce85db79..bb02cb08ac 100644
--- a/django/contrib/admin/sites.py
+++ b/django/contrib/admin/sites.py
@@ -4,6 +4,7 @@ from weakref import WeakSet
 from django.apps import apps
 from django.conf import settings
 from django.contrib.admin import ModelAdmin, actions
+from django.contrib.admin.exceptions import AlreadyRegistered, NotRegistered
 from django.contrib.admin.views.autocomplete import AutocompleteJsonView
 from django.contrib.auth import REDIRECT_FIELD_NAME
 from django.core.exceptions import ImproperlyConfigured
@@ -25,14 +26,6 @@ from django.views.i18n import JavaScriptCatalog
 all_sites = WeakSet()
 
 
-class AlreadyRegistered(Exception):
-    pass
-
-
-class NotRegistered(Exception):
-    pass
-
-
 class AdminSite:
     """
     An AdminSite object encapsulates an instance of the Django admin application, ready
diff --git a/django/contrib/admin/views/autocomplete.py b/django/contrib/admin/views/autocomplete.py
index 051b9a31b9..3c12c262ae 100644
--- a/django/contrib/admin/views/autocomplete.py
+++ b/django/contrib/admin/views/autocomplete.py
@@ -1,4 +1,5 @@
 from django.apps import apps
+from django.contrib.admin.exceptions import NotRegistered
 from django.core.exceptions import FieldDoesNotExist, PermissionDenied
 from django.http import Http404, JsonResponse
 from django.views.generic.list import BaseListView
@@ -74,8 +75,6 @@ class AutocompleteJsonView(BaseListView):
         Raise Http404 if the target model admin is not configured properly with
         search_fields.
         """
-        from django.contrib.admin.sites import NotRegistered
-
         term = request.GET.get("term", "")
         try:
             app_label = request.GET["app_label"]