Will Stackable rebuild this script?

Migrating a skip already discounted items script

This looks like the easiest guard in the whole library and it is the hardest. The question it asks is about the other discounts running alongside it, not about the product, and that is a different kind of question entirely.

Shopify platform limit

What the Script did

It skipped any line that had already been reduced by something else.

Run it against your own store

Paste it into Scripts rescue and watch what it rebuilds

Copy the Ruby with the button beside any Script on this page.
In your Shopify admin, open Stackable, then Tools, then Scripts rescue.
Paste it there, read what the tool says it will build, and compare that with the settings on this page.

Open Stackable

Scripts rescue is on the Pro plan. Nothing is published until you tell it what your old Script charged and the two figures match to the cent.

The Script

Shopify platform limit

The original Ruby

# GENERATED BY THE SHOPIFY SCRIPT CREATOR APP
# Version 0.12.0

class Campaign
  def initialize(condition, *qualifiers)
    @condition = (condition.to_s + '?').to_sym
    @qualifiers = PostCartAmountQualifier ? [] : [] rescue qualifiers.compact
    @post_amount_qualifiers = []
    @line_item_selector = qualifiers.last unless @line_item_selector
    qualifiers.compact.each do |qualifier|
      is_multi_select = qualifier.instance_variable_get(:@conditions).is_a?(Array)
      if is_multi_select
        qualifier.instance_variable_get(:@conditions).each do |nested_q|
          @post_amount_qualifiers << nested_q if nested_q.is_a?(PostCartAmountQualifier)
          @qualifiers << qualifier
        end
      else
        @post_amount_qualifiers << qualifier if qualifier.is_a?(PostCartAmountQualifier)
        @qualifiers << qualifier
      end
    end if @qualifiers.empty?
  end
end

class Selector
end

class ReducedItemSelector < Selector
  def initialize(match_type)
    @invert = match_type == :not
  end

  def match?(line_item)
    @invert ^ line_item.discounted?
  end
end

class PercentageDiscount
  def initialize(percent, message)
    @discount = (100 - percent) / 100.0
    @message = message
  end

  def apply(line_item)
    line_item.change_line_price(line_item.line_price * @discount, message: @message)
  end
end

class ConditionalDiscount < Campaign
  def initialize(condition, customer_qualifier, cart_qualifier, line_item_selector, discount, max_discounts)
    super(condition, customer_qualifier, cart_qualifier)
    @line_item_selector = line_item_selector
    @discount = discount
    @items_to_discount = max_discounts == 0 ? nil : max_discounts
  end

  def run(cart)
    raise "Campaign requires a discount" unless @discount
    return unless qualifies?(cart)
    applicable_items = cart.line_items.select { |item| @line_item_selector.nil? || @line_item_selector.match?(item) }
    applicable_items.each do |item|
      @discount.apply(item)
    end
  end
end

CAMPAIGNS = [
  ConditionalDiscount.new(
    :all,
    nil,
    nil,
    ReducedItemSelector.new(:not),
    PercentageDiscount.new(10, "10% off full price items"),
    0
  ),
].freeze

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

Output.cart = Input.cart

What happens to this one

Shopify cannot do this at checkout

Your Script checked whether an item had already been discounted by something else. Discounts at checkout all run at the same moment and cannot see each other's work, so that test could only ever be half right.

This is a limit in Shopify rather than a gap in Stackable. No discount app can rebuild it today, which is why the link below goes to Shopify's own documentation and not to ours.

Read Shopify's documentation

Reason key: platform.perLineAlreadyDiscounted

There is no cart to test here, because nothing is built. Pasting this produces the message above and no campaign at all.

Common questions

Will Stackable rebuild this script?: No, and the reason is stated rather than hidden: Your Script checked whether an item had already been discounted by something else. Discounts at checkout all run at the same moment and cannot see each other's work, so that test could only ever be half right.

Related Script shapes

Scoped to a tag or vendor

A discount limited to products carrying one tag, vendor or type.

Exclude sale items

Already-marked-down products protected from a second discount.

Exclude gift cards

Gift cards left out of a discount that would otherwise have hit them.

Read about migrating off Shopify Scripts All Script examples Browse discount examples

Paste your Script and see it rebuilt

The rebuild is checked against the money your old Script charged before you can publish it.

Install free