A mixin for success messages when an object is deleted

[Willem Van Onsem]

A case that is not covered by the SuccessMessageMixin is to add a successmessage when the object is removed.

It might be a good idea to create a mixin that will send a success message in case of a successful DELETE/POST request. This could look like:

diff --git a/django/contrib/messages/views.py b/django/contrib/messages/views.py
index eaa1bee9d5..ac938f7845 100644
--- a/django/contrib/messages/views.py
+++ b/django/contrib/messages/views.py
@@ -16,3 +16,21 @@ class SuccessMessageMixin:
 
     def get_success_message(self, cleaned_data):
         return self.success_message % cleaned_data
+
+
+class SuccessDeleteMessageMixin:
+    """
+    Add a success message on a successful DELETE request (and sometimes POST request
+    if this will make trigger delete).
+    """
+    success_message = ''
+
+    def delete(self, *args, **kwargs):
+        response = super().delete(*args, **kwargs)
+        success_message = self.get_success_message()
+        if success_message:
+            messages.success(self.request, success_message)
+        return response
+
+    def get_success_message(self):
+        return self.success_message

[Willem Van Onsem]

patch to apply

[Tim Graham]

Duplicate of #21936.