A nice little helper snippet for people who find themself wasting time writing boilerplate for catching “none of my functions matches” in controller actions.

Using this snippet you can safely write:

def some_action(conn, %{"myparam" => myparam}) when is_binary(myparam) do

without having to make a catchall function matching (conn, _) to match the non-valid uses of your action.

Code: https://gist.github.com/olivermt/b29e42e2cc537e9bf7f2