Shopify Plus users are able to install the internal Scripts App. It’s one of the benefits of upgrading.
You are going to have to learn a bit of Ruby if you want to get into scripts in depth, but the editor in the app gives you a split code/input development IDE to build yours.
There is also a github repo with prebuilt scripts here -> https://github.com/Shopify/shopify-scripts but be aware that these are not maintained and may not work perfectly.
The example below works, but will only work for a specific product. So if you add 1 item of one product and one item of another to your cart you won’t get 5% applied. You will only get 5% applied if you add two items of the same product and the discount will apply only to that product.
product_types doesn’t appear to have any effect on this script.
# Define a list of price tiers.
PRICE_TIERS = [
# Pricing tiers for Shoes
{
product_types: [],
group_by: :product, # :product or :variant
tiers: [
{
quantity: 2,
discount_percentage: 5,
discount_message: '5% saving'
},
{
quantity: 3,
discount_percentage: 15,
discount_message: '10% saving'
}
]
}
]
# You shouldn't need to edit anything below this line, unless you're a developer
# and know what you're doing :).
##
# Tiered pricing campaign.
class TieredPricingCampaign
def initialize(partitioner, tiers)
@partitioner = partitioner
@tiers = tiers.sort_by { |tier| tier[:quantity] }
end
def run(cart)
@partitioner.partition(cart).each do |k, items|
total_quantity = items.map(&:quantity).reduce(0, :+)
applicable_tier = find_tier_for_quantity(total_quantity)
unless applicable_tier.nil?
apply_tier_discount(items, applicable_tier)
end
end
end
private
def find_tier_for_quantity(quantity)
@tiers.select { |tier| tier[:quantity] <= quantity }.last
end
def apply_tier_discount(items, tier)
discount = get_tier_discount(tier)
items.each do |item|
discount.apply(item)
end
end
def get_tier_discount(tier)
PercentageDiscount.new(tier[:discount_percentage], tier[:discount_message])
end
end
##
# Select line items by product type.
class ProductTypeSelector
def initialize(product_types)
@product_types = Array(product_types).map(&:upcase)
end
def match?(line_item)
@product_types.include?(line_item.variant.product.product_type.upcase)
end
def group_key
@product_types.join(',')
end
end
##
# Apply a percentage discount to a line item.
class PercentageDiscount
def initialize(percent, message = '')
@percent = Decimal.new(percent) / 100.0
@message = message
end
def apply(item)
line_discount = item.original_line_price * @percent
new_line_price = item.original_line_price - line_discount
if new_line_price < item.line_price
item.change_line_price(new_line_price, message: @message)
end
end
end
##
# A pricing tier partition.
class TierPartitioner
def initialize(selector, group_by)
@selector = selector
@group_by = group_by
end
def partition(cart)
# Filter items
items = cart.line_items.select { |item| @selector.match?(item) }
# Group items using the appropriate key.
cart.line_items.group_by { |item| group_key(item) }
end
private
def group_key(line_item)
case @group_by
when :product
line_item.variant.product.id
when :variant
line_item.variant.id
else
@selector.group_key
end
end
end
##
# Instantiate and run Price Tiers.
PRICE_TIERS.each do |pt|
TieredPricingCampaign.new(
TierPartitioner.new(
ProductTypeSelector.new(pt[:product_types]),
pt[:group_by]
),
pt[:tiers]
).run(Input.cart)
end
##
# Export changes.
Output.cart = Input.cart
The script below works for all products. A very useful script if you want tier prices to apply across the board in your store;
# Define a list of price tiers.
PRICE_TIERS = [
# Pricing tiers for Shoes
{
product_types: ['All'], # set to 'All' if you don't want to limit to type/product
group_by: :none, # :product or :variant or :none(for 'All' products only)
tiers: [
{
quantity: 2,
discount_percentage: 5,
discount_message: '5% saving'
},
{
quantity: 3,
discount_percentage: 15,
discount_message: '10% saving'
}
]
}
]
# You shouldn't need to edit anything below this line, unless you're a developer
# and know what you're doing :).
##
# Tiered pricing campaign.
class TieredPricingCampaign
def initialize(partitioner, tiers)
@partitioner = partitioner
@tiers = tiers.sort_by { |tier| tier[:quantity] }
end
def run(cart)
@partitioner.partition(cart).each do |k, items|
puts items
total_quantity = items.map(&:quantity).reduce(0, :+)
applicable_tier = find_tier_for_quantity(total_quantity)
puts total_quantity
unless applicable_tier.nil?
apply_tier_discount(items, applicable_tier)
end
end
end
private
def find_tier_for_quantity(quantity)
@tiers.select { |tier| tier[:quantity] <= quantity }.last
end
def apply_tier_discount(items, tier)
discount = get_tier_discount(tier)
items.each do |item|
puts item
discount.apply(item)
end
end
def get_tier_discount(tier)
PercentageDiscount.new(tier[:discount_percentage], tier[:discount_message])
end
end
##
# Select line items by product type.
class ProductTypeSelector
def initialize(product_types)
@product_types = Array(product_types).map(&:upcase)
end
def match?(line_item)
if @product_types.length == 1 && @product_types[0] == 'ALL'
line_item
else
@product_types.include?(line_item.variant.product.product_type.upcase)
end
end
def group_key
@product_types.join(',')
end
end
##
# Apply a percentage discount to a line item.
class PercentageDiscount
def initialize(percent, message = '')
@percent = Decimal.new(percent) / 100.0
@message = message
end
def apply(item)
line_discount = item.original_line_price * @percent
new_line_price = item.original_line_price - line_discount
if new_line_price < item.line_price
item.change_line_price(new_line_price, message: @message)
end
end
end
##
# A pricing tier partition.
class TierPartitioner
def initialize(selector, group_by)
@selector = selector
@group_by = group_by
end
def partition(cart)
# Filter items
items = cart.line_items.select { |item| @selector.match?(item) }
# Group items using the appropriate key.
cart.line_items.group_by { |item| group_key(item) }
end
private
def group_key(line_item)
case @group_by
when :product
line_item.variant.product.id
when :variant
line_item.variant.id
when :none
else
@selector.group_key
end
end
end
##
# Instantiate and run Price Tiers.
PRICE_TIERS.each do |pt|
TieredPricingCampaign.new(
TierPartitioner.new(
ProductTypeSelector.new(pt[:product_types]),
pt[:group_by]
),
pt[:tiers]
).run(Input.cart)
end
##
# Export changes.
Output.cart = Input.cart