我應該如何更改他的腳本，以使其適用於收藏而不是Shopify中的一種產品？

Question

該腳本是Shopify中腳本編輯器應用程序隨附的模板。 我需要使其工作，以便如果您從一個系列中購買一種產品，那么從該系列中可以獲得另一種免費的產品。 該腳本僅適用於購買相同產品。 這是腳本：

PAID_ITEM_COUNT = 2
DISCOUNTED_ITEM_COUNT = 1

# Returns the integer amount of items that must be discounted next
# given the amount of items seen
#
def discounted_items_to_find(total_items_seen, discounted_items_seen)
  Integer(total_items_seen / (PAID_ITEM_COUNT + DISCOUNTED_ITEM_COUNT) * DISCOUNTED_ITEM_COUNT) - discounted_items_seen
end

# Partitions the items and returns the items that are to be discounted.
#
# Arguments
# ---------
#
# * cart
#   The cart to which split items will be added (typically Input.cart).
#
# * line_items
#   The selected items that are applicable for the campaign.
#
def partition(cart, line_items)
  # Sort the items by price from high to low
  sorted_items = line_items.sort_by{|line_item| line_item.variant.price}.reverse
  # Create an array of items to return
  discounted_items = []
  # Keep counters of items seen and discounted, to avoid having to recalculate on each iteration
  total_items_seen = 0
  discounted_items_seen = 0

  # Loop over all the items and find those to be discounted
  sorted_items.each do |line_item|
    total_items_seen += line_item.quantity
    # After incrementing total_items_seen, see if any items must be discounted
    count = discounted_items_to_find(total_items_seen, discounted_items_seen)
    # If there are none, skip to the next item
    next if count <= 0

    if count >= line_item.quantity
      # If the full item quantity must be discounted, add it to the items to return
      # and increment the count of discounted items
      discounted_items.push(line_item)
      discounted_items_seen += line_item.quantity
    else
      # If only part of the item must be discounted, split the item
      discounted_item = line_item.split(take: count)
      # Insert the newly-created item in the cart, right after the original item
      position = cart.line_items.find_index(line_item)
      cart.line_items.insert(position + 1, discounted_item)
      # Add it to the list of items to return
      discounted_items.push(discounted_item)
      discounted_items_seen += discounted_item.quantity
    end
  end

  # Return the items to be discounted
  discounted_items
end

eligible_items = Input.cart.line_items.select do |line_item|
  product = line_item.variant.product
  !product.gift_card? && product.id == 11380899340
end

discounted_line_items = partition(Input.cart, eligible_items)
discounted_line_items.each do |line_item|
  line_item.change_line_price(Money.zero, message: "Buy one Bolur, get one Bolur free")
end

Output.cart = Input.cart

我嘗試更改，似乎是相關的代碼：

eligible_items = Input.cart.line_items.select do |line_item|
  product = line_item.variant.product
  !product.gift_card? && product.id == 11380899340
end

對此：

eligible_items = Input.cart.line_items.select do |line_item|     
  product = line_item.variant.product      
  !product.gift_card? && **collection.id** == 123  
end

但我得到一個錯誤：

未定義的方法“收集”為主（您的購物車）

未定義方法“集合”（主要）（無客戶）

Answer 1

這里有兩件事：

1. line_item.variant.product沒有屬性collections 。 為此，您想使用line_item.product （ docs ）–（ 應該 ...請參見第二點）公開product對象的所有方法和屬性。

2. 但是，在嘗試做類似的事情（基於產品的折扣）時，我嘗試遍歷line_item.variant –並始終遇到undefined method 'product' for #<LineItem:0x7f9c97f9fff0>的undefined method 'product' for #<LineItem:0x7f9c97f9fff0>的錯誤。 我解釋為“在購物車腳本中訪問的line_items只能處於變體級別”。

所以，我想知道這是否是因為購物車僅包含變體（產品/顏色/尺寸），所以我們實際上不能按產品訪問line_items ，而只能按變體訪問。

我厭倦了遍歷line_item.product_id ，這也會引發類似的錯誤。 我認為我們只需要嘗試在variant級別上做一些棘手的事情。

我將查看是否可以通過變體ID訪問產品...返回文檔！

Answer 2

實際上，您無法進行收集，因此您需要修改腳本以使用產品類型或標簽。 該腳本需要進行大量修改才能用於多種產品，而不是同一產品的多個產品