Migrating a Shopify Help Center script template

# ================================ Customizable Settings ================================
# ================================================================
# Tiered Discount by Spend
#
#   If the cart total is greater than (or equal to) an entered
#   threshold, the associated discount is applied to each item.
# ================================================================
SPENDING_THRESHOLDS = [
  {
    threshold: 30,
    discount_type: :percent,
    discount_amount: 10,
    discount_message: '10% off for spending over $30',
  },
  {
    threshold: 60,
    discount_type: :percent,
    discount_amount: 15,
    discount_message: '15% off for spending over $60',
  },
]

# ================================ Script Code (do not edit) ================================
class DiscountApplicator
  def initialize(discount_type, discount_amount, discount_message)
    @discount_type = discount_type
    @discount_message = discount_message

    @discount_amount = if discount_type == :percent
      1 - (discount_amount * 0.01)
    else
      Money.new(cents: 100) * discount_amount
    end
  end

  def apply(line_item)
    new_line_price = if @discount_type == :percent
      line_item.line_price * @discount_amount
    else
      [line_item.line_price - (@discount_amount * line_item.quantity), Money.zero].max
    end

    line_item.change_line_price(new_line_price, message: @discount_message)
  end
end

class TieredDiscountBySpendCampaign
  def initialize(campaigns)
    @campaigns = campaigns
  end

  def run(cart)
    applicable_campaign = nil

    @campaigns.each do |campaign|
      threshold = Money.new(cents: 100) * campaign[:threshold]
      applicable_campaign = campaign if cart.subtotal_price >= threshold
    end

    return if applicable_campaign.nil?

    discount_applicator = DiscountApplicator.new(
      applicable_campaign[:discount_type],
      applicable_campaign[:discount_amount],
      applicable_campaign[:discount_message],
    )

    cart.line_items.each do |line_item|
      discount_applicator.apply(line_item)
    end
  end
end

CAMPAIGNS = [
  TieredDiscountBySpendCampaign.new(SPENDING_THRESHOLDS),
]

CAMPAIGNS.each do |campaign|
  campaign.run(Input.cart)
end

Output.cart = Input.cart

Herkend als Spend threshold discount en herbouwd als aanbieding van het type spend_goal. Dit zijn de echte configuratiesleutels waarmee de aanbieding wordt opgeslagen, zodat je je eigen herbouw veld voor veld kunt nalopen.

Gebouwd in onze openbare demowinkel, Meridian Goods, zodat elke prijs hier na te rekenen is in plaats van op vertrouwen aangenomen. De korting hieronder is wat dezelfde engine die bij het afrekenen draait, voor precies deze winkelwagen berekent.