Invoke method after create_update.(create|update|delete)_object methods

[das]

Sometimes it's useful to be able to invoke a method after the (create|update|delete)_object method saved or deleted your object. For example, to create a log message.

The attached patch adds a post_save_action/post_delete_action parameter to create_object, update_object and delete_object, which take a method object. After saving or deleting the object, the method is invoked before redirecting. Changes to documentation are included.

[Malcolm Tredinnick]

This seems to be making things more and more complicated in generic view land. It's getting to the point that they're effectively unusable because of the many, many parameters that form their own little language of configuration.

You can already achieve this result with a signal handler on the post_save and post_delete signals for the appropriate models. So let's not add another way to do the same thing.