Output.cart = Input.cart# Buy 2 Get 1 free Product
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 >= 1 && product.id != 6725535170767 && product.product_type != ‘Clothing’
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 2 Get 1 Free”)
end

End

Free product Script

customer = Input.cart.customer
discountfree = false;
countproduct=0
Input.cart.line_items.each do |line_item|
product = line_item.variant.product
if product.id == 6725535170767
discountfree = true
end
countproduct += 1
end
puts discountfree
if discountfree
Input.cart.line_items.each do |line_item|
product = line_item.variant.product
if(countproduct > 1)
if product.id == 6725535170767
line_item.change_line_price(line_item.line_price – (line_item.line_price * 1), message: “Free Product”)
end
end
end
end

Output.cart = Input.cart