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Jan 3, 2023
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# Custom promotion - Buy at least X items from catalog entries and get a discount on related catalog entries.

Problem: Buy at least X items from catalog entries and get related catalog entries at a discount that satisfy the below formula.

or

Create a custom promotion to ‘Buy Products for Discount from Other Selections’ and apply the below formula to get a discount on other selections.

### Formula = m x n,  then get the discounts on n items.

m = Spend at least X items

n = Multiplier

e.g.

m = 2

n = 1, 2,3……

 CART
 Main Product SKU Qty. Other Selection SKU Qty. Eligible Discount Qty. 2 x 1 1 1 2 x 2 2 2 2 x 3 4 3 2 x 4 5 4 .... .... .... m x n .... n

If you notice the above table ‘Other Selection SKU Qty.’ column, customer added more than the eligible discounted qty in the cart. So, we need to make sure the discount is only eligible for 'Eligible Discount Qty.' not for all ‘Other Selection SKU Qty.’.

Solution:

1. Create a custom entry promotion
``````   [ContentType(
GUID = "CB99C622-A170-4EF6-B28D-077B18BAFD81",
GroupName = "Custom - Promotions",
DisplayName = "Custom - Buy products for discount from other selection",
Description = "Buy at least X items from catalog entries and get related catalog entries at a discount e.g. (2 + 1),  (4 + 2),  (6 + 3) ... ",
Order = 30000)]
[PromotionSettings(FixedRedemptionsPerOrder = 1)]
public class CustomBuyQuantityGetItemDiscount : EntryPromotion, IMonetaryDiscount
{
[Display(Order = 10)]
[PromotionRegion("Condition")]
public virtual PurchaseQuantity Condition { get; set; }

[Display(Order = 20)]
[PromotionRegion("Reward")]
public virtual DiscountItems DiscountTarget { get; set; }

[Display(Order = 30)]
[PromotionRegion("Discount")]
public virtual MonetaryReward Discount { get; set; }
}
``````

2. Create custom discount processor and override following methods:

• GetPromotionItems
• Return promotion conditions and reward items.
• RewardDescription
• Read all discounted SKUs with the max eligible qty for discounts.
• Create Redemption Description into GetRedemptions.
``````public class CustomBuyQuantityGetItemDiscountProcessor : EntryPromotionProcessorBase<CustomBuyQuantityGetItemDiscount>
{

RedemptionDescriptionFactory redemptionDescriptionFactory,
: base(redemptionDescriptionFactory)
{
}

{
return new PromotionItems(
promotionData,
new CatalogItemSelection(promotionData.Condition.Items, CatalogItemSelectionType.Specific, true),
new CatalogItemSelection(promotionData.DiscountTarget.Items, CatalogItemSelectionType.Specific, true));
}

protected override RewardDescription Evaluate(
PromotionProcessorContext context)
{
var allLineItems = this.GetLineItems(context.OrderForm)?
.ToList();

if (promotionData?.DiscountTarget?.Items == null ||
promotionData?.Condition?.Items == null ||
promotionData?.Condition?.RequiredQuantity == 0 ||
allLineItems.Count() == 0)
{
return
RewardDescription.CreateNotFulfilledDescription(
promotionData,
FulfillmentStatus.NotFulfilled);
}

var excludedVariants = new List<string>() { };
if (promotionData.ExcludedItems != null && promotionData.ExcludedItems.Count > 0)
{
foreach (ContentReference item in promotionData.ExcludedItems)
{
{
.Select(x => x.Code)
.ToList());
}
else if (_contentLoader.TryGet(item, out ProductContent productContent))
{
.Select(x => x.Code)
.ToList());
}
else
{
}
}
}

var conditionSkus = new List<string>() { };
foreach (ContentReference item in promotionData.Condition.Items)
{
{
.Select(x => x.Code)
.ToList());
}
else if (_contentLoader.TryGet(item, out ProductContent productContent))
{
.Select(x => x.Code)
.ToList());
}
else
{
}
}
var discountSkus = new List<string>() { };
foreach (ContentReference item in promotionData.DiscountTarget.Items)
{
{
.Select(x => x.Code)
.ToList());
}
else if (_contentLoader.TryGet(item, out ProductContent productContent))
{
.Select(x => x.Code)
.ToList());
}
else
{
}
}

//remove the discounted SKUs if exist in the excluded list.
if (excludedVariants.Count() > 0)
{
discountSkus = discountSkus.Where(x => !excludedVariants.Contains(x)).ToList();
conditionSkus = conditionSkus.Where(x => !excludedVariants.Contains(x)).ToList();
}

var totalPurchasedQty = allLineItems.Where(x => conditionSkus.Contains(x.Code)).Sum(x => x.Quantity);
var maxDiscountedQty = Math.Floor(totalPurchasedQty / promotionData.Condition.RequiredQuantity);
if (promotionData.DiscountTarget.MaxQuantity != null &&
maxDiscountedQty > promotionData.DiscountTarget.MaxQuantity)
{
maxDiscountedQty = (decimal)promotionData.DiscountTarget.MaxQuantity;
}

if (maxDiscountedQty == decimal.Zero)
{
return RewardDescription.CreateNotFulfilledDescription(
promotionData,
FulfillmentStatus.InvalidCoupon);
}

var discountedLineItems = allLineItems
.Where(x => discountSkus.Contains(x.Code))
.OrderByDescending(x => x.PlacedPrice)
.ThenBy(x => x.Quantity)
.ToList();

return
RewardDescription.CreateMoneyOrPercentageRewardDescription(
FulfillmentStatus.Fulfilled,
GetRedemptions(promotionData, context, discountedLineItems, maxDiscountedQty),
promotionData,
promotionData.Discount,
context.OrderGroup.Currency,
promotionData.Name);
}

private IEnumerable<RedemptionDescription> GetRedemptions(
PromotionProcessorContext context,
List<ILineItem> discountedLineItems,
decimal maxQty)
{
List<RedemptionDescription> redemptionDescriptionList = new List<RedemptionDescription>();
var applicableCodes = discountedLineItems.Select(x => x.Code);
decimal val2 = GetLineItems(context.OrderForm).Where(li => applicableCodes.Contains(li.Code)).Sum(li => li.Quantity);
decimal num = Math.Min(GetMaxRedemptions(promotionData.RedemptionLimits), val2);

for (int index = 0; index < num; ++index)
{
AffectedEntries entries = context.EntryPrices.ExtractEntries(applicableCodes, Math.Min(maxQty, val2), promotionData);
if (entries != null)
{
}
}

return redemptionDescriptionList;
}
}
``````

Wishing you a year full of blessing and filled with a new adventure.

Happy new year 2023!

Cheers🥂

Jan 03, 2023

Ashish Rasal Jan 6, 2023 03:57 AM

Nicely explained.

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