The answer might be obvious, but I sure can't find it.
How do I related two tables in a model using a parent (the one side of
a one-to-many relationship) field other than "id", and a child (the
many side of a one-to-many relationship) field other than
Yes, I can write sql, and no, I don't want to. Because it's so much
nicer to keep everything in the ROR framework. will_paginate, for