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 | class Message < ActiveRecord::Base
  
  attr_accessible :body
  default_scope order(:created_at)
  belongs_to :discussion, :counter_cache => true, :touch => true
  belongs_to :user
  validates :user, :discussion, :body, :presence => true
  after_save :mark_discussion_as_read
  def visible_for? user
    self.created_at.to_i >= self.discussion.user_invited_at(user).to_i
  end
  
  def unread_for? user
    speaker = self.discussion.find_speaker_by_user(user)
    if speaker
      self.created_at.to_i >= speaker.updated_at.to_i
    else
      true
    end
  end
  private
  def mark_discussion_as_read
    self.discussion.mark_as_read_for(self.user)
  end
end
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