Adding custom (succes/failure) messages to the admin site

[metzeltiger]

When you for example save a new object in the admin site this small yellow bar on top will appear telling you "everything's saved correctly".
It would be very useful if you were able to create your own custom messages here.

[Ivan Giuliani]

You can do this by overriding ModelAdmin.response_add() (or .response_change), so closing as invalid. Follows an example, just for future reference:

class TestAdmin(admin.ModelAdmin):
    def response_add(self, request, obj, post_url_continue='../%s/'):
        ret = super(Model1Admin, self).response_add(request, obj, post_url_continue)
        request.user.get_and_delete_messages()
        request.user.message_set.create(
                message="Your custom message here"
        )
        return ret