perfect code in ROR

gistfile1.txt

  One.  coupon_id => coupon.business => business.stores
    
  1.{
    get '/:id', rabl: 'coupon' do
      authenticate!
      @coupon = Coupon.find params[:id] 
    end
    
    object @coupon
    attributes :id, :name, :category, :business_name, :expired_at
    node(:expired_on) {|coupon| time_ago_in_words(coupon.expired_at) }
    node(:business) {|coupon| partial('business', object: @coupon.business) }
    }
    
  2.{
      get '/:id', rabl: 'business' do
        authenticate!
        @business = Business.find params[:id]
      end
      
      object @business
      attributes :id, :website, :logo, :description
      node(:stores) { |business| partial('_store', object: business.stores) }
      
      attributes :id, :telephone, :address, :lat, :lng, :state
    }  
    
    
    Two.   
    def available_coupons
    coupons = Coupon.where("expired_at >= ?", Time.now)
    coupons = coupons.where("id not in (?)", coupon_ids) if coupon_ids.count > 0
    coupons
    end