Rails: Tableless model that calls other models

Question

I have a Rails app with a few model classes (e.g. Category, Subcategory, User, etc.). In order to implement a not-too-trivial filter funct

Answer 1

I wonder if you want ::Category - getting Category from the top-level namespace rather than scoping it to FilterCategory?

If your models are in the app/models directory, you shouldn't need to explicitly require them - Rails already takes care of that.