Let the user know they successfully duplicated a model

[ckonkel]

When you get to the view page, it would be nice to have a message saying the model was duplicated successfully.

[ns139426]

You could wrap this code into an action if you wanted to have a confirmation popup and return message. I used this in a project today.
https://gist.github.com/ns139426/aa4997886cef5b5c9e11de6e0fdffb5a