How can I tell the controller I need the movie
file names for that specific movie within the
In general, you're going to do a find on the movie_files table for each movie. What the find looks like depends on what your movie_files table schema looks like.
The other thing you'll need to address is the data structure to pass to your view. My personal preference would probably be to construct a hash of hashes in the controller, but there are other ways. Share some more info and we can probably be of more help.