@gdub01,
I’ve got your point. You are right, it should be a way to update the URL in such cases. The best could be if it would be updated automatically, when you poke the corresponding assign. I can’t see the way how to do it right now, but obviously the helper function to update the URL is possible. I will add it to TODO list.
@OvermindDL1,
well, your posts inspired me to go that way 
Additionally, I’d like to create something which is intuitive to Phoenix programmer. Less API, more Magic 
