ruby on rails - rails3 user can only vote once per day -

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class rate < activerecord::base  attr_accessible :image_id, :rate, :user_id  belongs_to :image  belongs_to :user  validate :user_can_rate_after_one_day   before_save :default_values  def default_values  self.rate ||=0 end  protected   def user_can_rate_after_one_day     r=rate.where(:image_id =>image_id, :user_id=> user_id).order("created_at desc").limit(1)      if( (time.now - 1.day) < r[0].created_at)       self.errors.add(:rate,"you can vote once per day")      else       return     end   end end

i have 1 rate model, , want user can rate once per day. write user_can_rate_after_one_day method validte it. if delete function, user can rate many time, if add function, user can not rate it. knows what's wrong here? thanks


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