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

class Post < ActiveRecord::Base
  named_scope :containing_the_letter_a, :conditions => "body LIKE '%a%'"
  named_scope :with_authors_at_address, lambda { |address| {
      :conditions => [ 'authors.author_address_id = ?', address.id ],
      :joins => 'JOIN authors ON authors.id = posts.author_id'
    }
  }

  belongs_to :author do
    def greeting
      "hello"
    end
  end

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

  has_one :last_comment, :class_name => 'Comment', :order => 'id desc'

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

  has_many :comments_with_interpolated_conditions, :class_name => 'Comment',
      :conditions => ['#{"#{aliased_table_name}." rescue ""}body = ?', 'Thank you for the welcome']

  has_one  :very_special_comment
  has_one  :very_special_comment_with_post, :class_name => "VerySpecialComment", :include => :post
  has_many :special_comments
  has_many :nonexistant_comments, :class_name => 'Comment', :conditions => 'comments.id < 0'

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

  belongs_to              :creatable_author,     :class_name => 'Author',   :accessible => true
  has_one                 :uncreatable_comment,  :class_name => 'Comment',  :accessible => false, :order => 'id desc'
  has_one                 :creatable_comment,    :class_name => 'Comment',  :accessible => true,  :order => 'id desc'
  has_many                :creatable_comments,   :class_name => 'Comment',  :accessible => true,  :dependent => :destroy
  has_and_belongs_to_many :creatable_categories, :class_name => 'Category', :accessible => true

  has_many :taggings, :as => :taggable
  has_many :tags, :through => :taggings 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
  has_many :people_with_callbacks, :source=>:person, :through => :readers,
              :before_add    => lambda {|owner, reader| log(:added,   :before, reader.first_name) },
              :after_add     => lambda {|owner, reader| log(:added,   :after,  reader.first_name) },
              :before_remove => lambda {|owner, reader| log(:removed, :before, reader.first_name) },
              :after_remove  => lambda {|owner, reader| log(:removed, :after,  reader.first_name) }

  def self.reset_log
    @log = []
  end
  
  def self.log(message=nil, side=nil, new_record=nil)
    return @log if message.nil?
    @log << [message, side, new_record]
  end

  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
  self.table_name = Post.table_name
end