Feat(medusa, medusa-js, medusa-react): Include sales channels in related queries as an optional expand parameter (#1816)

**What**
- Add `transformQuery` to get endpoints for product, order and cart
  - ensure that the default relations (when getting a singular entity) includes sales channels when enabled
- Add `EmptyQueryParams` class in common types to prevent query parameters while using `transformQuery`
- update product-, order- and cartFactory to include sales channels if provided
- remove `packages/medusa/src/controllers/products/admin-list-products.ts`

**Testing** 
- expands sales channel for single order
- expands sales channels for orders with expand parameter 
- returns single product with sales channel 
- expands sales channels for products with expand parameter
- returns cart with sales channel for single cart

Fixes CORE-293

Co-authored-by: Sebastian Rindom <7554214+srindom@users.noreply.github.com>
Co-authored-by: Adrien de Peretti <25098370+adrien2p@users.noreply.github.com>

integration-tests/api/factories/simple-cart-factory.ts

@@ -11,6 +11,10 @@ import {
   simpleLineItemFactory,
 } from "./simple-line-item-factory"
 import { RegionFactoryData, simpleRegionFactory } from "./simple-region-factory"
+import {
+  SalesChannelFactoryData,
+  simpleSalesChannelFactory,
+} from "./simple-sales-channel-factory"
 import {
   ShippingMethodFactoryData,
   simpleShippingMethodFactory,
@@ -24,6 +28,7 @@ export type CartFactoryData = {
   line_items?: LineItemFactoryData[]
   shipping_address?: AddressFactoryData
   shipping_methods?: ShippingMethodFactoryData[]
+  sales_channel?: SalesChannelFactoryData
 }
 
 export const simpleCartFactory = async (
@@ -62,6 +67,14 @@ export const simpleCartFactory = async (
 
   const address = await simpleAddressFactory(connection, data.shipping_address)
 
+  let sales_channel
+  if (typeof data.sales_channel !== "undefined") {
+    sales_channel = await simpleSalesChannelFactory(
+      connection,
+      data.sales_channel
+    )
+  }
+
   const id = data.id || `simple-cart-${Math.random() * 1000}`
   const toSave = manager.create(Cart, {
     id,
@@ -70,6 +83,7 @@ export const simpleCartFactory = async (
     region_id: regionId,
     customer_id: customerId,
     shipping_address_id: address.id,
+    sales_channel_id: sales_channel?.id ?? null,
   })
 
   const cart = await manager.save(toSave)
@@ -79,7 +93,7 @@ export const simpleCartFactory = async (
     await simpleShippingMethodFactory(connection, { ...sm, cart_id: id })
   }
 
-  const items = data.line_items
+  const items = data.line_items || []
   for (const item of items) {
     await simpleLineItemFactory(connection, { ...item, cart_id: id })
   }

integration-tests/api/factories/simple-order-factory.ts

@@ -6,7 +6,6 @@ import {
   PaymentStatus,
   FulfillmentStatus,
 } from "@medusajs/medusa"
-
 import {
   DiscountFactoryData,
   simpleDiscountFactory,
@@ -24,6 +23,10 @@ import {
   ShippingMethodFactoryData,
   simpleShippingMethodFactory,
 } from "./simple-shipping-method-factory"
+import {
+  SalesChannelFactoryData,
+  simpleSalesChannelFactory,
+} from "./simple-sales-channel-factory"
 
 export type OrderFactoryData = {
   id?: string
@@ -37,6 +40,7 @@ export type OrderFactoryData = {
   discounts?: DiscountFactoryData[]
   shipping_address?: AddressFactoryData
   shipping_methods?: ShippingMethodFactoryData[]
+  sales_channel?: SalesChannelFactoryData
 }
 
 export const simpleOrderFactory = async (
@@ -79,6 +83,14 @@ export const simpleOrderFactory = async (
     )
   }
 
+  let sales_channel
+  if (typeof data.sales_channel !== "undefined") {
+    sales_channel = await simpleSalesChannelFactory(
+      connection,
+      data.sales_channel
+    )
+  }
+
   const id = data.id || `simple-order-${Math.random() * 1000}`
   const toSave = manager.create(Order, {
     id,
@@ -92,6 +104,7 @@ export const simpleOrderFactory = async (
     currency_code: currencyCode,
     tax_rate: taxRate,
     shipping_address_id: address.id,
+    sales_channel_id: sales_channel?.id ?? null,
   })
 
   const order = await manager.save(toSave)
@@ -101,16 +114,17 @@ export const simpleOrderFactory = async (
     await simpleShippingMethodFactory(connection, { ...sm, order_id: order.id })
   }
 
-  const items = data.line_items.map((item) => {
-    let adjustments = item?.adjustments || []
-    return {
-      ...item,
-      adjustments: adjustments.map((adj) => ({
-        ...adj,
-        discount_id: discounts.find((d) => d.code === adj?.discount_code),
-      })),
-    }
-  })
+  const items =
+    data.line_items?.map((item) => {
+      const adjustments = item?.adjustments || []
+      return {
+        ...item,
+        adjustments: adjustments.map((adj) => ({
+          ...adj,
+          discount_id: discounts.find((d) => d.code === adj?.discount_code),
+        })),
+      }
+    }) || []
 
   for (const item of items) {
     await simpleLineItemFactory(connection, { ...item, order_id: id })

integration-tests/api/factories/simple-product-factory.ts

@@ -12,6 +12,10 @@ import {
   ProductVariantFactoryData,
   simpleProductVariantFactory,
 } from "./simple-product-variant-factory"
+import {
+  SalesChannelFactoryData,
+  simpleSalesChannelFactory,
+} from "./simple-sales-channel-factory"
 
 export type ProductFactoryData = {
   id?: string
@@ -22,6 +26,7 @@ export type ProductFactoryData = {
   tags?: string[]
   options?: { id: string; title: string }[]
   variants?: ProductVariantFactoryData[]
+  sales_channels?: SalesChannelFactoryData[]
 }
 
 export const simpleProductFactory = async (
@@ -43,6 +48,16 @@ export const simpleProductFactory = async (
     type: ShippingProfileType.GIFT_CARD,
   })
 
+  let sales_channels
+  if (data.sales_channels) {
+    sales_channels = await Promise.all(
+      data.sales_channels.map(
+        async (salesChannel) =>
+          await simpleSalesChannelFactory(connection, salesChannel)
+      )
+    )
+  }
+
   const prodId = data.id || `simple-product-${Math.random() * 1000}`
   const productToCreate = {
     id: prodId,
@@ -77,6 +92,8 @@ export const simpleProductFactory = async (
 
   const toSave = manager.create(Product, productToCreate)
 
+  toSave.sales_channels = sales_channels
+
   await manager.save(toSave)
 
   const optionId = `${prodId}-option`