rails--rails/activerecord/test/fixtures/post.rb

class Post < ActiveRecord::Base
  belongs_to :author do
    def greeting
      "hello"
    end
  end

  belongs_to :author_with_posts, :class_name => "Author", :include => :posts

  has_many   :comments, :order => "body" do
    def find_most_recent
      find(:first, :order => "id DESC")
    end
  end

  has_one  :very_special_comment
  has_one  :very_special_comment_with_post, :class_name => "VerySpecialComment", :include => :post
  has_many :special_comments

  has_and_belongs_to_many :categories
  has_and_belongs_to_many :special_categories, :join_table => "categories_posts", :association_foreign_key => 'category_id'

  has_many :taggings, :as => :taggable
  has_many :tags, :through => :taggings, :include => :tagging do
    def add_joins_and_select
      find :all, :select => 'tags.*, authors.id as author_id', :include => false,
        :joins => 'left outer join posts on taggings.taggable_id = posts.id left outer join authors on posts.author_id = authors.id'
    end
  end
  
  has_many :funky_tags, :through => :taggings, :source => :tag
  has_many :super_tags, :through => :taggings
  has_one :tagging, :as => :taggable

  has_many :invalid_taggings, :as => :taggable, :class_name => "Tagging", :conditions => 'taggings.id < 0'
  has_many :invalid_tags, :through => :invalid_taggings, :source => :tag

  has_many :categorizations, :foreign_key => :category_id
  has_many :authors, :through => :categorizations

  has_many :readers
  has_many :people, :through => :readers

  def self.what_are_you
    'a post...'
  end
end

class SpecialPost < Post; end;

class StiPost < Post
  self.abstract_class = true
  has_one :special_comment, :class_name => "SpecialComment"
end

class SubStiPost < StiPost
end