Feat(order): order changes (#6614)

This is a PR to keep them relatively small. Very likely changes, validations and other features will be added.

What:
  Basic methods to cancel, confirm or decline order changes
  Apply order changes to modify and create a new version of an order

Things related to calculation, Order and Item totals are not covered in this PR. Properties won't match with definition, etc.

Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

packages/order/src/models/order-change.ts

@@ -12,11 +12,11 @@ import {
   Enum,
   ManyToOne,
   OnInit,
+  OneToMany,
   OptionalProps,
   PrimaryKey,
   Property,
 } from "@mikro-orm/core"
-import { OneToMany } from "typeorm"
 import Order from "./order"
 import OrderChangeAction from "./order-change-action"
 
@@ -64,8 +64,8 @@ export default class OrderChange {
   @VersionIndex.MikroORMIndex()
   version: number
 
-  @OneToMany(() => OrderChangeAction, (action) => action.order_change_id, {
-    cascade: [Cascade.REMOVE],
+  @OneToMany(() => OrderChangeAction, (action) => action.order_change, {
+    cascade: [Cascade.PERSIST],
   })
   actions = new Collection<OrderChangeAction>(this)
 
@@ -77,7 +77,7 @@ export default class OrderChange {
 
   @Enum({ items: () => OrderChangeStatus, default: OrderChangeStatus.PENDING })
   @OrderChangeStatusIndex.MikroORMIndex()
-  status: OrderChangeStatus
+  status: OrderChangeStatus = OrderChangeStatus.PENDING
 
   @Property({ columnType: "text", nullable: true })
   internal_note: string | null = null
@@ -92,7 +92,7 @@ export default class OrderChange {
     columnType: "timestamptz",
     nullable: true,
   })
-  requested_at?: Date
+  requested_at: Date | null = null
 
   @Property({ columnType: "text", nullable: true })
   confirmed_by: string | null = null // customer or user ID
@@ -101,7 +101,7 @@ export default class OrderChange {
     columnType: "timestamptz",
     nullable: true,
   })
-  confirmed_at?: Date
+  confirmed_at: Date | null = null
 
   @Property({ columnType: "text", nullable: true })
   declined_by: string | null = null // customer or user ID