***

title: "ShippingLineAssignmentStrategy"
generated: true
---------------

<GenerationInfo sourceFile="packages/core/src/config/shipping-method/shipping-line-assignment-strategy.ts" sourceLine="52" packageName="@vendure/core" since="2.0.0" />

This strategy is used to assign a given [ShippingLine](/current/core/reference/typescript-api/entities/shipping-line#shippingline) to one or more [OrderLine](/current/core/reference/typescript-api/entities/order-line#orderline)s of the Order.
This allows you to set multiple shipping methods for a single order, each assigned a different subset of
OrderLines.

The [DefaultShippingLineAssignmentStrategy](/current/core/reference/typescript-api/shipping/default-shipping-line-assignment-strategy#defaultshippinglineassignmentstrategy) simply assigns *all* OrderLines, so is suitable for the
most common scenario of a single shipping method per Order.

:::info

This is configured via the `shippingOptions.shippingLineAssignmentStrategy` property of
your VendureConfig.

:::

Here's an example of a custom ShippingLineAssignmentStrategy which assigns digital products to a
different ShippingLine to physical products:

```ts
import {
    Order,
    OrderLine,
    RequestContext,
    ShippingLine,
    ShippingLineAssignmentStrategy,
} from '@vendure/core';

export class DigitalShippingLineAssignmentStrategy implements ShippingLineAssignmentStrategy {
    assignShippingLineToOrderLines(
        ctx: RequestContext,
        shippingLine: ShippingLine,
        order: Order,
    ): OrderLine[] | Promise<OrderLine[]> {
        if (shippingLine.shippingMethod.customFields.isDigital) {
            return order.lines.filter(l => l.productVariant.customFields.isDigital);
        } else {
            return order.lines.filter(l => !l.productVariant.customFields.isDigital);
        }
    }
}
```

```ts title="Signature"
interface ShippingLineAssignmentStrategy extends InjectableStrategy {
    assignShippingLineToOrderLines(
        ctx: RequestContext,
        shippingLine: ShippingLine,
        order: Order,
    ): OrderLine[] | Promise<OrderLine[]>;
}
```

* Extends: [`InjectableStrategy`](/current/core/reference/typescript-api/common/injectable-strategy#injectablestrategy)

<div className="members-wrapper">

### assignShippingLineToOrderLines

\<MemberInfo kind="method" type={`(ctx: <a href='/current/core/reference/typescript-api/request/request-context#requestcontext'>RequestContext</a>, shippingLine: <a href='/current/core/reference/typescript-api/entities/shipping-line#shippingline'>ShippingLine</a>, order: <a href='/current/core/reference/typescript-api/entities/order#order'>Order</a>) => <a href='/current/core/reference/typescript-api/entities/order-line#orderline'>OrderLine</a>[] | Promise<<a href='/current/core/reference/typescript-api/entities/order-line#orderline'>OrderLine</a>[]>`}   />

</div>