i would like to create a buy one get one free , but using shopify default template , it seams after sorting , the discount is applied alternatively instead of the lowest one , please suggest what changes should i do in this code so that always only the lowest priced should get as free
meas if i add 3 products of price 30,20 and 10 each , in cart after bogo offer i could see the 20 dollar one as free instead of 10 dollor one
- please not their is no restriction on how many free products can be got in a order , for every product purchased a free item can be added
PAID_ITEM_COUNT = 1
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.tags.include?(“last call”)
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, get one free”)
end
Output.cart = Input.cart