title: Django admin show success message when saving model
body: <p>I'm new to django and trying to get a success message to show when I save a form in the admin. I want it to show at the top of the page which lists all items for the model (changelist page I think).</p>
  <p>I've had a look through several posts here and the django documentation and worked out I need to use the messages framework and overwrite the save_model method in my model admin, here's what I have so far:</p>
  <pre><code>class scoutGroupAdmin(admin.ModelAdmin):
      def save_model(self, request, obj, form, change):
          messages.add_message(request, messages.INFO, 'Hello world.')
          super(scoutGroupAdmin,self).save_model(request, obj, form, change)
  </code></pre>
  <p>I've tried multiple versions of the above but no matter what I do when I go back to the changelist page there is no message displayed. Again I'm just learning django so please let me know if I'm missing something obvious !</p>
  <p>Thanks</p>