Lets say that I want to have one url that can map to two different
controllers. For example /posts could map to controller 'public/
posts' or to the controller 'admin/posts' based on whether or not the
user has logged in. This isn't a great example because I could just
use '/admin/posts', but in my scenario the url has to be the same.
I was hoping to use a before_filter to either render one action or the
other. It looks like render_component would have let me accomplish
this, but it has been deprecated.