feat(): Backport metadata management (#11469)

FIXES FRMW-2915

**What**
Backport metadata management. all the metadata get preserved unless a specific empty string is provided for the key which in turn would remove that key from the metadata

packages/core/utils/src/modules-sdk/__tests__/medusa-internal-service.ts

@@ -45,10 +45,13 @@ describe("Internal Module Service Factory", () => {
     let instance
 
     beforeEach(() => {
-      jest.clearAllMocks()
       instance = new IMedusaInternalService(containerMock)
     })
 
+    afterEach(() => {
+      jest.clearAllMocks()
+    })
+
     it("should throw model id undefined error on retrieve if id is not defined", async () => {
       const err = await instance.retrieve().catch((e) => e)
       expect(err.message).toBe("model - id must be defined")
@@ -201,7 +204,7 @@ describe("Internal Module Service Factory", () => {
         updateData,
       ])
 
-      const result = await instance.update(updateData)
+      const result = await instance.update({ selector: {}, data: updateData })
       expect(result).toEqual([updateData])
     })
 
@@ -223,6 +226,32 @@ describe("Internal Module Service Factory", () => {
       ])
     })
 
+    it("should update entities metadata successfully", async () => {
+      const updateData = {
+        id: "1",
+        name: "UpdatedItem",
+        metadata: { key1: "", key2: "key2" },
+      }
+      const entitiesToUpdate = [
+        { id: "1", name: "Item", metadata: { key1: "value1" } },
+      ]
+
+      containerMock[modelRepositoryName].find.mockClear()
+      containerMock[modelRepositoryName].find.mockResolvedValueOnce(
+        entitiesToUpdate
+      )
+
+      await instance.update({ selector: {}, data: updateData })
+      expect(
+        containerMock[modelRepositoryName].update.mock.calls[0][0][0].update
+      ).toEqual({
+        ...updateData,
+        metadata: {
+          key2: "key2",
+        },
+      })
+    })
+
     it("should delete entity successfully", async () => {
       await instance.delete("1")
       expect(containerMock[modelRepositoryName].delete).toHaveBeenCalledWith(

packages/core/utils/src/modules-sdk/medusa-internal-service.ts

@@ -17,6 +17,7 @@ import {
   isString,
   lowerCaseFirst,
   MedusaError,
+  mergeMetadata,
 } from "../common"
 import { FreeTextSearchFilterKeyPrefix } from "../dal"
 import { DmlEntity, toMikroORMEntity } from "../dml"
@@ -350,6 +351,16 @@ export function MedusaInternalService<
         return []
       }
 
+      // Manage metadata if needed
+      toUpdateData.forEach(({ entity, update }) => {
+        if (isPresent(update.metadata)) {
+          entity.metadata = update.metadata = mergeMetadata(
+            entity.metadata ?? {},
+            update.metadata
+          )
+        }
+      })
+
       return await this[propertyRepositoryName].update(
         toUpdateData,
         sharedContext