dynamic named routes in the view

url_for isn't deprecated; it's passing a symbol to it that's
deprecated. You can avoid this by wrapping a send() around it:

  is_admin? ? send(:"admin_#{name_of_route}_url" : :"#{name_of_route}_url")

Seems like there should be a better way. At least put that stuff in a
helper method.

Oops, what I posted was a syntax error. Sorry! That looks much better.