Removed using argument from admin's get_deleted_objects().

django/contrib/admin/actions.py

@@ -6,7 +6,6 @@ from django.contrib import messages
 from django.contrib.admin import helpers
 from django.contrib.admin.utils import get_deleted_objects, model_ngettext
 from django.core.exceptions import PermissionDenied
-from django.db import router
 from django.template.response import TemplateResponse
 from django.utils.translation import gettext as _, gettext_lazy
 
@@ -28,12 +27,10 @@ def delete_selected(modeladmin, request, queryset):
     if not modeladmin.has_delete_permission(request):
         raise PermissionDenied
 
-    using = router.db_for_write(modeladmin.model)
-
     # Populate deletable_objects, a data structure of all related objects that
     # will also be deleted.
     deletable_objects, model_count, perms_needed, protected = get_deleted_objects(
-        queryset, request.user, modeladmin.admin_site, using,
+        queryset, request.user, modeladmin.admin_site,
     )
 
     # The user has already confirmed the deletion.

django/contrib/admin/options.py

@@ -1750,12 +1750,10 @@ class ModelAdmin(BaseModelAdmin):
         if obj is None:
             return self._get_obj_does_not_exist_redirect(request, opts, object_id)
 
-        using = router.db_for_write(self.model)
-
         # Populate deleted_objects, a data structure of all related objects that
         # will also be deleted.
         deleted_objects, model_count, perms_needed, protected = get_deleted_objects(
-            [obj], request.user, self.admin_site, using,
+            [obj], request.user, self.admin_site,
         )
 
         if request.POST and not protected:  # The user has confirmed the deletion.

django/contrib/admin/utils.py

@@ -4,7 +4,7 @@ from collections import defaultdict
 
 from django.contrib.auth import get_permission_codename
 from django.core.exceptions import FieldDoesNotExist
-from django.db import models
+from django.db import models, router
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.deletion import Collector
 from django.forms.utils import pretty_name
@@ -117,7 +117,7 @@ def flatten_fieldsets(fieldsets):
     return field_names
 
 
-def get_deleted_objects(objs, user, admin_site, using):
+def get_deleted_objects(objs, user, admin_site):
     """
     Find all objects related to ``objs`` that should also be deleted. ``objs``
     must be a homogeneous iterable of objects (e.g. a QuerySet).
@@ -125,6 +125,12 @@ def get_deleted_objects(objs, user, admin_site, using):
     Return a nested list of strings suitable for display in the
     template with the ``unordered_list`` filter.
     """
+    try:
+        obj = objs[0]
+    except IndexError:
+        return [], {}, set(), []
+    else:
+        using = router.db_for_write(obj._meta.model)
     collector = NestedObjects(using=using)
     collector.collect(objs)
     perms_needed = set()