class PraiseTreadCache < ActiveRecord::Base
  attr_accessible :object_id,:object_type,:praise_num,:tread_num
  
  def plus(num)
    self.update_attribute(:praise_num, self.praise_num.to_i + num)
  end

  def minus(num)
    self.update_attribute(:praise_num, self.praise_num.to_i - num)
  end
end