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