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class PrivateMessage < ActiveRecord::Base
belongs_to :user
belongs_to :target, :class_name => 'User', :foreign_key => 'target_id'
# user_id： 发送者id，非真实发送者id
# target_id： 接受者id，非真实接受者id
# sender_id：发送者id，真实的发送者id
# receiver_id：接受者id，真实的接受者id
# content：消息内容
# send_time：消息发送时间
# status：消息状态 0：未读 1：已读 2：删除，标记不同消息状态
attr_accessible :content, :receiver_id, :send_time, :sender_id, :status, :target_id, :user_id
end
