Discount Rules / Rewards

Define when a Discount should apply and what should be the Reward in Umbraco Commerce.

Discounts in Umbraco Commerce are defined using a series of rules and reward builders that let you configure the following:

When a Discount should apply.
What the Reward should be for that Discount.

These builders come with a handful of the most common Rules and Rewards that should suit the majority of web stores' needs. When need to create your own Rules or Rewards then these are extendable via a Provider model allowing you to incorporate your own custom logic.

Discount Rules

There are two types of Discount Rules in Umbraco Commerce:

Order Discount Rules: Determine whether a discount should apply to an Order. Returns a Fulfilled/Unfulfilled status depending on whether the Rule logic has been met.
Order Line Discount Rules: Determine whether a discount should apply to an Order Line within an Order. Returns a Fulfilled/Unfulfilled status depending on whether the Rule logic has been met. Where the status is Fulfilled, a list of all Order Lines that are fulfilled by this Rule is also returned.

Example: Custom Order Discount Rule Provider

An example of an Order Discount Rule Provider would look something like this:

[DiscountRuleProvider("myCustomOrderRule", "My Custom Order Rule")]
public class MyCustomOrderRuleProvider : OrderDiscountRuleProviderBase<MyCustomOrderRuleProviderSettings>
{
    public override DiscountRuleResult ValidateRule(DiscountRuleContext ctx, MyCustomOrderRuleProviderSettings settings)
    {
        if (/* Some custom logic */)
            return Fulfilled();
        
        return Unfulfilled();
    }
}

public class MyCustomOrderRuleProviderSettings
{
    [DiscountRuleProviderSetting(Key = "priceType",
        Name = "Price Type",
        Description = "The type of price to compare against")]
    public OrderPriceType PriceType { get; set; }

    ...
}

All Order Discount Rule Providers inherit from a base class OrderDiscountRuleProviderBase<TSettings>. TSettings is the type of a Plain Old Class Object (POCO) model class representing the Discount Rule Providers settings.

See the Settings Objects section below for more information on Settings objects.

The class must be decorated with DiscountRuleProviderAttribute which defines the Discount Rule Providers alias and name, and can also specify a description or icon to be displayed in the backoffice. The DiscountRuleProviderAttribute is also responsible for defining a labelView for the Provider.

See the Label views section below for more information on Label Views.

Rule Providers have a ValidateRule method that accepts a DiscountRuleContext as well as an instance of the Providers TSettings settings model. Inside this you can perform your custom logic, returning a DiscountRuleResult to notify Umbraco Commerce of the Rule outcome.

If the passed-in context (which contains a reference to the Order) meets the Rule's criteria, then a fulfilled DiscountRuleResult can be returned by calling return Fulfilled();. Alternatively, if the Order didn't meet the Rules criteria an unfulfilled DiscountRuleResult can be returned by calling return Unfulfilled();.

Example: Custom Order Line Discount Rule Provider

An example of an Order Line Discount Rule Provider would look something like this:

[DiscountRuleProvider("myCustomOrderLineRule", "My Custom Order Line Rule")]
public class MyCustomOrderLineRuleProvider : OrderLineDiscountRuleProviderBase<MyCustomOrderLineRuleProviderSettings>
{
    public override DiscountRuleResult ValidateRule(DiscountRuleContext ctx, MyCustomOrderLineRuleProviderSettings settings)
    {
        if (/* Some custom logic */)
            return Fulfilled(fulfilledOrderLines);
        
        return Unfulfilled();
    }
}

public class MyCustomOrderLineRuleProviderSettings
{
    [DiscountRuleProviderSetting(Key = "priceType",
        Name = "Price Type",
        Description = "The type of price to compare against")]
    public OrderPriceType PriceType { get; set; }

    ...
}

All Order Line Discount Rule Providers inherit from a base class OrderLineDiscountRuleProviderBase<TSettings> and follows much the same requirements as the Order Discount Rule Provider defined above. Where they differ is in the ValidateRule method implementation and when a fulfilled DiscountRuleResult is returned. In this case, an Order Line Discount Rule returns a collection of Order Lines processed by the Rule that have met the rules criteria. Whether the rules are met, is checked by calling return Fulfilled(fulfilledOrderLines);.

Discount Rewards

Example: Custom Discount Reward Provider

An example of a Discount Reward Provider would look something like this:

[DiscountRewardProvider("myDiscountReward", "My Discount Reward")]
public class MyDiscountRewardProvider : DiscountRewardProviderBase<MyDiscountRewardProviderSettings>
{
    public override DiscountRewardCalculation CalculateReward(DiscountRewardContext ctx, MyDiscountRewardProviderSettings settings)
    {
        var result = new DiscountRewardCalculation();

        // Some custom calculation logic goes here 

        return result;
    }
}

public class MyDiscountRewardProviderSettings
{
    [DiscountRewardProviderSetting(Key = "priceType",
        Name = "Price Type",
        Description = "The price that will be affected by this reward")]
    public OrderPriceType PriceType { get; set; }

    ...
}

All Discount Reward Providers inherit from a base class DiscountRewardProviderBase<TSettings>. TSettings is the Type of a POCO model class representing the Discount Reward Providers settings.

See the Settings Objects documentation for more information on Settings objects.

The class must be decorated with DiscountRewardProviderAttribute which defines the Discount Reward Providers alias and name. It can also specify a description or icon to be displayed in the Umbraco Commerce backoffice. The DiscountRewardProviderAttribute is responsible for defining a labelView for the Provider.

See the Label views section below for more information on Label Views.

Reward Providers have a CalculateReward method that accepts a DiscountRewardContext as well as an instance of the Providers TSettings settings model. Inside this, you can perform your custom calculation logic, returning a DiscountRewardCalculation instance that defines any Reward values to apply to the Order.

// Add a shipping total discount
result.ShippingTotalPriceAdjustments.Add(new DiscountAdjustment(ctx.Discount, price));

// Add a subtotal discount
result.SubtotalPriceAdjustments.Add(new DiscountAdjustment(ctx.Discount, price));

Common Features

Settings Objects

See the Settings Objects documentation for more information on Settings objects.

Label Views

Both the DiscountRuleProviderAttribute and the DiscountRewardProviderAttribute allow you to define a labelView for the Provider. It should be the path to an Angular JS view file that will be used to render a label in the Rule/Reward Builder UI. Where no labelView is supplied, one will be looked for by convention at the following location:

~/app_plugins/umbracocommerce/views/discount/{Type}/labelViews/{ProviderAlias}.html

Type is either rules or rewards, depending on the Type of Provider it refers to. ProviderAlias is the alias of the Provider.

The Rule/Reward Label View should provide a user-friendly summary of its settings to display in the relevant Builder UI.

The Label View file will be passed a model property which will be a JavaScript representation of the given Providers settings object.

<span ng-if="model.priceType">Order {{ model.priceType | umbracoCommerceSplitCamelCase }} Discount</span>

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Last updated 1 year ago