Feat(inventory-next, medusa): Add List inventory items endpoint (#6694)

* code for list inventory items

* fix integration tests

* move integration test

* calculate reserved and stocked quantities in db

* update lockfile

packages/inventory-next/src/models/inventory-item.ts

@@ -3,7 +3,9 @@ import {
   Collection,
   Entity,
   Filter,
+  Formula,
   OnInit,
+  OnLoad,
   OneToMany,
   OptionalProps,
   PrimaryKey,
@@ -106,7 +108,21 @@ export class InventoryItem {
     () => InventoryLevel,
     (inventoryLevel) => inventoryLevel.inventory_item
   )
-  inventory_levels = new Collection<InventoryLevel>(this)
+  location_levels = new Collection<InventoryLevel>(this)
+
+  @Formula(
+    (item) =>
+      `(SELECT SUM(reserved_quantity) FROM inventory_level il WHERE il.inventory_item_id = ${item}.id)`,
+    { lazy: true, serializer: Number, hidden: true }
+  )
+  reserved_quantity: number
+
+  @Formula(
+    (item) =>
+      `(SELECT SUM(stocked_quantity) FROM inventory_level il WHERE il.inventory_item_id = ${item}.id)`,
+    { lazy: true, serializer: Number, hidden: true }
+  )
+  stocked_quantity: number
 
   @BeforeCreate()
   private beforeCreate(): void {

packages/inventory-next/src/models/inventory-level.ts

@@ -4,11 +4,12 @@ import {
   Filter,
   ManyToOne,
   OnInit,
+  OnLoad,
   PrimaryKey,
   Property,
 } from "@mikro-orm/core"
+import { DALUtils, isDefined } from "@medusajs/utils"
 
-import { DALUtils } from "@medusajs/utils"
 import { InventoryItem } from "./inventory-item"
 import { createPsqlIndexStatementHelper } from "@medusajs/utils"
 import { generateEntityId } from "@medusajs/utils"
@@ -91,6 +92,8 @@ export class InventoryLevel {
   })
   inventory_item: InventoryItem
 
+  available_quantity: number | null = null
+
   @BeforeCreate()
   private beforeCreate(): void {
     this.id = generateEntityId(this.id, "ilev")
@@ -101,4 +104,11 @@ export class InventoryLevel {
   private onInit(): void {
     this.id = generateEntityId(this.id, "ilev")
   }
+
+  @OnLoad()
+  private onLoad(): void {
+    if (isDefined(this.stocked_quantity) && isDefined(this.reserved_quantity)) {
+      this.available_quantity = this.stocked_quantity - this.reserved_quantity
+    }
+  }
 }