Yesterday I had one of those moments in Rails where I knew there must be a really good way to do something, there had to be.  But all I could think of was the brute force way.

Technically speaking, I wanted to create collections of child objects on a parent object where the membership of each collection depended on whether the parent and the child shared an attribute in common.

In simpler terms, imagine you have a group blog.  Each post in the blog is written by one of several authors.  A Post belongs to an Author. (Read More)