随着假期的到来，我的团队正在为我们的Shopify商店开发一个脚本，防止我们的客户使用折扣码，如果他们有以下之一在他们的购物车：捐赠、已在销售的商品以及符合F30 335 i赠品资格的商品。以下是我目前拥有的代码：

##disable discount codes##
error_message = 'Cannot use Discount. Reason(s) : '
marzano_donation_id = 6723597598805
marzano_donation = false
Input.cart.line_items.each do |line_item|
product = line_item.variant.product
puts product.id
if Input.cart.discount_code != nil 
    # only runs if customer has discount code
  if product.id == marzano_donation_id
    # marzano_donation = true
    marzano_error = "Marzano's Donation in cart, "
    error_message.concat(marzano_error)
        # Input.cart.discount_code.reject({message: "1"})
        
end
end
end


list_of_invalid_vendors = []
vendor_message = "Invalid vendors in cart : #{list_of_invalid_vendors}"
contains_vendor = false

vendor_list = ["Evolution Racewerks", "Kies Giveaway Items", "Precision Raceworks"]
Input.cart.line_items.each do |line_item|
vendor = line_item.variant.product.vendor
if vendor_list.include? vendor

    list_of_invalid_vendors.append(vendor)
    if Input.cart.discount_code != nil
      error_message.concat(vendor_message)
      puts list_of_invalid_vendors
      puts vendor_message
    end

  puts list_of_invalid_vendors
end

end
puts contains_vendor


contains_giveaway = false
Input.cart.line_items.each do |line_item|
product = line_item.variant.product
next unless product.tags.include?('Kies Giveaway Items')
# Input.cart.discount_code.reject({message: "3"})
    # contains_giveaway = true
    giveaway_error = " Cannot use discount code on Kies Giveaway Items, "
    error_message.concat(giveaway_error)
end
puts contains_giveaway
puts "123"

if Input.cart.discount_code != nil
Input.cart.discount_code.reject({message: "#{error_message}"})
end 

Output.cart = Input.cart

目前，通过这个输出，我可以得到我想要的错误消息--但只有当它是字符串时。
最后一个问题是要显示客户购物车中的无效供应商，如下所示：

list_of_invalid_vendors = []
vendor_message = "Invalid vendors in cart : #{list_of_invalid_vendors}"
contains_vendor = false

vendor_list = ["Evolution Racewerks", "Kies Giveaway Items", "Precision Raceworks"]
Input.cart.line_items.each do |line_item|
vendor = line_item.variant.product.vendor
if vendor_list.include? vendor

    list_of_invalid_vendors.append(vendor)
    if Input.cart.discount_code != nil
      error_message.concat(vendor_message)
      puts list_of_invalid_vendors
      puts vendor_message
    end

  puts list_of_invalid_vendors
end

end

我想要的是输出以下内容的代码：“无法使用折扣，购物车中的供应商无效：进化赛车，精密赛车”
但我得到的却是：
无法使用折扣。原因：购物车中的供应商无效：[]