class Topic < ActiveRecord::Base named_scope :base named_scope :written_before, lambda { |time| { :conditions => ['written_on < ?', time] } } named_scope :approved, :conditions => {:approved => true} named_scope :replied, :conditions => ['replies_count > 0'] named_scope :anonymous_extension do def one 1 end end module NamedExtension def two 2 end end module MultipleExtensionOne def extension_one 1 end end module MultipleExtensionTwo def extension_two 2 end end named_scope :named_extension, :extend => NamedExtension named_scope :multiple_extensions, :extend => [MultipleExtensionTwo, MultipleExtensionOne] has_many :replies, :dependent => :destroy, :foreign_key => "parent_id" serialize :content before_create :default_written_on before_destroy :destroy_children def parent Topic.find(parent_id) end # trivial method for testing Array#to_xml with :methods def topic_id id end protected def approved=(val) @custom_approved = val write_attribute(:approved, val) end def default_written_on self.written_on = Time.now unless attribute_present?("written_on") end def destroy_children self.class.delete_all "parent_id = #{id}" end def after_initialize if self.new_record? self.author_email_address = 'test@test.com' end end end