fix(medusa): Include inventory quantity when listing products (#3586)

* initial inclusion of quantities when listing admin prices

* add changeset

* rename variable

* add inventory service check when listing products

* update changeset version bump

.changeset/olive-days-jog.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/medusa": minor
+---
+
+Fix(medusa): include quantities when listing admin products with an inventory module installed

packages/medusa/src/api/routes/admin/products/list-products.ts

@@ -1,10 +1,16 @@
 import { IsNumber, IsOptional, IsString } from "class-validator"
-import { PricingService, ProductService } from "../../../../services"
+import {
+  PricingService,
+  ProductService,
+  ProductVariantInventoryService,
+  SalesChannelService,
+} from "../../../../services"
 
-import { Type } from "class-transformer"
-import { Product } from "../../../../models"
-import { PricedProduct } from "../../../../types/pricing"
 import { FilterableProductProps } from "../../../../types/product"
+import { PricedProduct } from "../../../../types/pricing"
+import { Product } from "../../../../models"
+import { Type } from "class-transformer"
+import { IInventoryService } from "@medusajs/types"
 
 /**
  * @oas [get] /admin/products
@@ -214,6 +220,13 @@ import { FilterableProductProps } from "../../../../types/product"
  */
 export default async (req, res) => {
   const productService: ProductService = req.scope.resolve("productService")
+  const inventoryService: IInventoryService | undefined =
+    req.scope.resolve("inventoryService")
+  const productVariantInventoryService: ProductVariantInventoryService =
+    req.scope.resolve("productVariantInventoryService")
+  const salesChannelService: SalesChannelService = req.scope.resolve(
+    "salesChannelService"
+  )
   const pricingService: PricingService = req.scope.resolve("pricingService")
 
   const { skip, take, relations } = req.listConfig
@@ -232,6 +245,18 @@ export default async (req, res) => {
     products = await pricingService.setProductPrices(rawProducts)
   }
 
+  if (inventoryService) {
+    const [salesChannelsIds] = await salesChannelService.listAndCount(
+      {},
+      { select: ["id"] }
+    )
+
+    products = await productVariantInventoryService.setProductAvailability(
+      products,
+      salesChannelsIds.map((salesChannel) => salesChannel.id)
+    )
+  }
+
   res.json({
     products,
     count,

packages/medusa/src/services/product-variant-inventory.ts

@@ -1,16 +1,17 @@
+import { EntityManager, In } from "typeorm"
 import {
   ICacheService,
   IInventoryService,
-  InventoryItemDTO,
   IStockLocationService,
+  InventoryItemDTO,
   ReservationItemDTO,
   ReserveQuantityContext,
 } from "@medusajs/types"
-import { isDefined, MedusaError, TransactionBaseService } from "@medusajs/utils"
-import { EntityManager, In } from "typeorm"
 import { LineItem, Product, ProductVariant } from "../models"
-import { ProductVariantInventoryItem } from "../models/product-variant-inventory-item"
+import { MedusaError, TransactionBaseService, isDefined } from "@medusajs/utils"
 import { PricedProduct, PricedVariant } from "../types/pricing"
+
+import { ProductVariantInventoryItem } from "../models/product-variant-inventory-item"
 import ProductVariantService from "./product-variant"
 import SalesChannelInventoryService from "./sales-channel-inventory"
 import SalesChannelLocationService from "./sales-channel-location"
@@ -629,7 +630,7 @@ class ProductVariantInventoryService extends TransactionBaseService {
 
   async setVariantAvailability(
     variants: ProductVariant[] | PricedVariant[],
-    salesChannelId: string | undefined
+    salesChannelId: string | string[] | undefined
   ): Promise<ProductVariant[] | PricedVariant[]> {
     if (!this.inventoryService_) {
       return variants
@@ -649,11 +650,23 @@ class ProductVariantInventoryService extends TransactionBaseService {
         // first get all inventory items required for a variant
         const variantInventory = await this.listByVariant(variant.id)
 
-        variant.inventory_quantity =
-          await this.getVariantQuantityFromVariantInventoryItems(
-            variantInventory,
-            salesChannelId
-          )
+        const salesChannelArray = Array.isArray(salesChannelId)
+          ? salesChannelId
+          : [salesChannelId]
+
+        const quantities = await Promise.all(
+          salesChannelArray.map(async (salesChannel) => {
+            return await this.getVariantQuantityFromVariantInventoryItems(
+              variantInventory,
+              salesChannel
+            )
+          })
+        )
+
+        variant.inventory_quantity = quantities.reduce(
+          (acc, next) => acc + (next || 0),
+          0
+        )
 
         return variant
       })
@@ -662,7 +675,7 @@ class ProductVariantInventoryService extends TransactionBaseService {
 
   async setProductAvailability(
     products: (Product | PricedProduct)[],
-    salesChannelId: string | undefined
+    salesChannelId: string | string[] | undefined
   ): Promise<(Product | PricedProduct)[]> {
     return await Promise.all(
       products.map(async (product) => {