RoR開發-建立model表之間的關系

class Message < ActiveRecord::Base

  belongs_to :fromClientUser, :class_name => "ClientUser",

  :foreign_key => "from_id"

  belongs_to :toClientUser, :class_name => "ClientUser",

  :foreign_key => "to_id"

  has_many :childs,:class_name => "Message", :foreign_key => "parent_msg_id",:order=>"id desc"

  belongs_to :parent,:class_name => "Message", :foreign_key => "parent_msg_id"

end