ticket 36028: add AdminSite.template_engine option

django/contrib/admin/actions.py

@@ -91,4 +91,5 @@ def delete_selected(modeladmin, request, queryset):
             "admin/delete_selected_confirmation.html",
         ],
         context,
+        using=modeladmin.admin_site.template_engine
     )

django/contrib/admin/options.py

@@ -1403,6 +1403,7 @@ class ModelAdmin(BaseModelAdmin):
                 "admin/change_form.html",
             ],
             context,
+            using=self.admin_site.template_engine,
         )
 
     def _get_preserved_qsl(self, request, preserved_filters):
@@ -1458,6 +1459,7 @@ class ModelAdmin(BaseModelAdmin):
                 {
                     "popup_response_data": popup_response_data,
                 },
+                using=self.admin_site.template_engine,
             )
 
         elif "_continue" in request.POST or (
@@ -1540,6 +1542,7 @@ class ModelAdmin(BaseModelAdmin):
                 {
                     "popup_response_data": popup_response_data,
                 },
+                using=self.admin_site.template_engine,
             )
 
         opts = self.opts
@@ -1720,6 +1723,7 @@ class ModelAdmin(BaseModelAdmin):
                 {
                     "popup_response_data": popup_response_data,
                 },
+                using=self.admin_site.template_engine,
             )
 
         self.message_user(
@@ -1766,6 +1770,7 @@ class ModelAdmin(BaseModelAdmin):
                 "admin/delete_confirmation.html",
             ],
             context,
+            using=self.admin_site.template_engine,
         )
 
     def get_inline_formsets(self, request, formsets, inline_instances, obj=None):
@@ -2035,6 +2040,7 @@ class ModelAdmin(BaseModelAdmin):
                     {
                         "title": _("Database error"),
                     },
+                    using=self.admin_site.template_engine,
                 )
             return HttpResponseRedirect(request.path + "?" + ERROR_FLAG + "=1")
 
@@ -2189,6 +2195,7 @@ class ModelAdmin(BaseModelAdmin):
                 "admin/change_list.html",
             ],
             context,
+            using=self.admin_site.template_engine,
         )
 
     def get_deleted_objects(self, objs, request):
@@ -2329,6 +2336,7 @@ class ModelAdmin(BaseModelAdmin):
                 "admin/object_history.html",
             ],
             context,
+            using=self.admin_site.template_engine,
         )
 
     def get_formset_kwargs(self, request, obj, inline, prefix):

django/contrib/admin/sites.py

@@ -53,6 +53,7 @@ class AdminSite:
     empty_value_display = "-"
 
     login_form = None
+    template_engine = None
     index_template = None
     app_index_template = None
     login_template = None
@@ -572,7 +573,7 @@ class AdminSite:
         request.current_app = self.name
 
         return TemplateResponse(
-            request, self.index_template or "admin/index.html", context
+            request, self.index_template or "admin/index.html", context, using=self.template_engine
         )
 
     def app_index(self, request, app_label, extra_context=None):
@@ -597,6 +598,7 @@ class AdminSite:
             self.app_index_template
             or ["admin/%s/app_index.html" % app_label, "admin/app_index.html"],
             context,
+            using=self.template_engine,
         )
 
     def get_log_entries(self, request):

docs/ref/contrib/admin/index.txt

@@ -2949,6 +2949,11 @@ Templates can override or extend base admin templates as described in
     The text to put at the top of the admin index page (a string). By default,
     this is "Site administration".
 
+.. attribute:: AdminSite.template_engine
+
+    Name of a template engine, as specified in your ``TEMPLATES`` setting, that
+    will be used to render the admin site's views.
+
 .. attribute:: AdminSite.index_template
 
     Path to a custom template that will be used by the admin site main index

tests/admin_views/sites.py

@@ -0,0 +1,4 @@
+from django.contrib import admin
+
+class CustomAdminSiteWithCustomTemplateEngine(admin.AdminSite):
+    template_engine = "custom_template_engine"

tests/admin_views/test_adminsite.py

@@ -6,6 +6,7 @@ from django.test.client import RequestFactory
 from django.urls import path, reverse
 
 from .models import Article
+from .sites import CustomAdminSiteWithCustomTemplateEngine
 
 site = admin.AdminSite(name="test_adminsite")
 site.register(User)
@@ -126,3 +127,20 @@ class SiteActionsTests(SimpleTestCase):
         self.assertEqual(self.site.get_action(action_name), delete_selected)
         self.site.disable_action(action_name)
         self.assertEqual(self.site.get_action(action_name), delete_selected)
+
+class AdminSiteCustomTemplateEngineTests(TestCase):
+    request_factory = RequestFactory()
+
+    @classmethod
+    def setUp(cls):
+        cls.user = User.objects.create_superuser(
+            username="super", password="secret", email="super@example.com"
+        )
+
+    def test_template_engine(self):
+        admin_site = CustomAdminSiteWithCustomTemplateEngine(name="other")
+        request = RequestFactory().get("/")
+        request.user = self.user
+        index_response = admin_site.index(request=request)
+
+        self.assertEqual(index_response.using, CustomAdminSiteWithCustomTemplateEngine.template_engine)