Topic: HABTM or has_many :through and uniqueness?
I've been using a "has_and_belongs_to_many" relationship to assign categories to items in my database. It's working great but it's quite easy to mistakenly add a category to the same item twice.
So the question is this: Is there a method similar to "validates_uniqueness_of" that will check for duplicate HABTM associations?
* Multiple child models in a dynamic form