hotfix(CartService): Preserve metadata on line-item updates

packages/medusa/src/api/routes/store/carts/__tests__/update-line-item.js

@@ -34,7 +34,8 @@ describe("POST /store/carts/:id/line-items/:line_id", () => {
       expect(LineItemServiceMock.generate).toHaveBeenCalledWith(
         IdMap.getId("eur-10-us-12"),
         IdMap.getId("region-france"),
-        3
+        3,
+        {}
       )
     })
 
@@ -48,6 +49,51 @@ describe("POST /store/carts/:id/line-items/:line_id", () => {
     })
   })
 
+  describe("successfully updates a line item with metadata", () => {
+    let subject
+
+    beforeAll(async () => {
+      const cartId = IdMap.getId("cartLineItemMetadata")
+      const lineId = IdMap.getId("lineWithMetadata")
+      subject = await request(
+        "POST",
+        `/store/carts/${cartId}/line-items/${lineId}`,
+        {
+          payload: {
+            quantity: 3,
+          },
+        }
+      )
+    })
+
+    afterAll(() => {
+      jest.clearAllMocks()
+    })
+
+    it("calls CartService create", () => {
+      expect(CartServiceMock.updateLineItem).toHaveBeenCalledTimes(1)
+    })
+
+    it("calls LineItemService generate", () => {
+      expect(LineItemServiceMock.generate).toHaveBeenCalledTimes(1)
+      expect(LineItemServiceMock.generate).toHaveBeenCalledWith(
+        IdMap.getId("eur-10-us-12"),
+        IdMap.getId("region-france"),
+        3,
+        { status: "confirmed" }
+      )
+    })
+
+    it("returns 200", () => {
+      expect(subject.status).toEqual(200)
+    })
+
+    it("returns the cart", () => {
+      expect(subject.body.cart._id).toEqual(IdMap.getId("cartLineItemMetadata"))
+      expect(subject.body.cart.decorated).toEqual(true)
+    })
+  })
+
   describe("removes line item on quantity 0", () => {
     let subject
 

packages/medusa/src/api/routes/store/carts/update-line-item.js

@@ -34,7 +34,8 @@ export default async (req, res) => {
       const lineItem = await lineItemService.generate(
         existing.content.variant._id,
         cart.region_id,
-        value.quantity
+        value.quantity,
+        existing.metadata || {}
       )
 
       cart = await cartService.updateLineItem(cart._id, line_id, lineItem)