feat(cart): Line item adjustments (#6112)

packages/cart/src/models/adjustment-line.ts

@@ -14,19 +14,19 @@ export default abstract class AdjustmentLine {
   id: string
 
   @Property({ columnType: "text", nullable: true })
-  description?: string | null
+  description: string | null = null
 
   @Property({ columnType: "text", nullable: true })
-  promotion_id?: string | null
+  promotion_id: string | null = null
 
-  @Property({ columnType: "text" })
-  code: string
+  @Property({ columnType: "text", nullable: true })
+  code: string | null = null
 
-  @Property({ columnType: "numeric" })
+  @Property({ columnType: "numeric", serializer: Number })
   amount: number
 
   @Property({ columnType: "text", nullable: true })
-  provider_id?: string | null
+  provider_id: string | null = null
 
   @Property({
     onCreate: () => new Date(),

packages/cart/src/models/index.ts

@@ -1,7 +1,7 @@
 export { default as Address } from "./address"
 export { default as Cart } from "./cart"
 export { default as LineItem } from "./line-item"
-export { default as LineItemAdjustmentLine } from "./line-item-adjustment-line"
+export { default as LineItemAdjustment } from "./line-item-adjustment"
 export { default as LineItemTaxLine } from "./line-item-tax-line"
 export { default as ShippingMethod } from "./shipping-method"
 export { default as ShippingMethodAdjustmentLine } from "./shipping-method-adjustment-line"

packages/cart/src/models/line-item-adjustment.ts

@@ -1,20 +1,29 @@
 import { generateEntityId } from "@medusajs/utils"
 import {
   BeforeCreate,
+  Check,
   Entity,
   ManyToOne,
-  OnInit
+  OnInit,
+  Property,
 } from "@mikro-orm/core"
 import AdjustmentLine from "./adjustment-line"
 import LineItem from "./line-item"
 
 @Entity({ tableName: "cart_line_item_adjustment_line" })
-export default class LineItemAdjustmentLine extends AdjustmentLine {
+@Check<LineItemAdjustment>({
+  expression: (columns) => `${columns.amount} >= 0`,
+})
+export default class LineItemAdjustment extends AdjustmentLine {
   @ManyToOne(() => LineItem, {
-    joinColumn: "line_item",
-    fieldName: "line_item_id",
+    onDelete: "cascade",
+    nullable: true,
+    index: "IDX_adjustment_line_item_id",
   })
-  line_item: LineItem
+  item?: LineItem | null
+
+  @Property({ columnType: "text" })
+  item_id: string
 
   @BeforeCreate()
   onCreate() {

packages/cart/src/models/line-item.ts

@@ -14,7 +14,7 @@ import {
   Property,
 } from "@mikro-orm/core"
 import Cart from "./cart"
-import LineItemAdjustmentLine from "./line-item-adjustment-line"
+import LineItemAdjustment from "./line-item-adjustment"
 import LineItemTaxLine from "./line-item-tax-line"
 
 type OptionalLineItemProps =
@@ -116,13 +116,13 @@ export default class LineItem {
   tax_lines = new Collection<LineItemTaxLine>(this)
 
   @OneToMany(
-    () => LineItemAdjustmentLine,
-    (adjustment) => adjustment.line_item,
+    () => LineItemAdjustment,
+    (adjustment) => adjustment.item,
     {
       cascade: [Cascade.REMOVE],
     }
   )
-  adjustments = new Collection<LineItemAdjustmentLine>(this)
+  adjustments = new Collection<LineItemAdjustment>(this)
 
   /** COMPUTED PROPERTIES - START */