If you're tired of having to prefix all your Katello classes with "Katello::", just do "cd Katello". This only works in pry though and not irb.
[15] foreman » cd Katello
[16] foreman » ContentView.find(1)
...
[17] foreman » KTEnvironment.find(1)
...
I don't know why I didn't think of it before. I hope this helps someone else out though.
David