denormalize-field
Postgres only as of 0.2
Denormalizes fields in ActiveRecord models in order to avoid SQL joins and hydrating Ruby Objects to obtain a simple fields.
Usage
class Post < ActiveRecord::Base
belongs_to :category
denormalizes :category => :name
end
category = Category.create(:name => "News")
post = Post.create(:category => category)
post.category_name # "News" (you have to create the migration to add Post#category_name manually)