def self.note_search(params)
    matches = Coupon.all

    params.each do |key, val|

      case key
        when 'from'
          if val.present? && params[:to].present?
            from = Time.parse(params[:from]).beginning_of_day
            to = Time.parse(params[:to]).end_of_day
            matches.where!(created_at: from..to)
          end

        when 'promo_code'
          if val.present?
            val.split(' ').each do |t|
              t = "%#{t.downcase}%"
              matches.where!("lower(title) LIKE ? or lower(coupon) LIKE ?", t, t )
            end
          end

      end

    end
    matches
  end