search for: last_post

I''m building a simple forum system which features a topics and a posts table. The topic model has a has_many association with the post model, i.e.: class Topic < ActiveRecord::Base { has_many :posts } class Post < ActiveRecord:Base { belongs_to :topic, :dependent => true } Now, I wish to sort the topics by the created_at property of the last post, but I can''t

...een bending my head around a has_one association for about 3 hours now and I can''t get it to work. I''m pretty sure it''s not something I''m overlooking anymore. Here''s the essential part of the schema I''m working with: ----- t :topics c :id c :last_post_id t :posts c :id c :topic_id ----- Topics are simply named containers for posts. I decided not to use virtual tables since 99% of the columns would be topic-related. In the topic model I have the following associations: ----- has_many(:posts) has_one(:last_post, {:class_name => ''P...