fix(order): remove nested entities (#8250)

integration-tests/http/__tests__/returns/returns.spec.ts

@@ -380,6 +380,10 @@ medusaIntegrationTestRunner({
           {},
           adminHeaders
         )
+
+        result = (await api.get(`/admin/returns?fields=*items`, adminHeaders))
+          .data.returns
+        expect(result).toHaveLength(2)
       })
 
       // Simple lifecyle:

packages/modules/order/src/utils/transform-order.ts

@@ -4,6 +4,7 @@ import {
   decorateCartTotals,
   deduplicate,
   isDefined,
+  isObject,
 } from "@medusajs/utils"
 
 // Reshape the order object to match the OrderDTO
@@ -99,10 +100,15 @@ export function formatOrder(
 }
 
 function cleanNestedRelations(obj) {
-  delete obj.order
-  delete obj.return
-  delete obj.claim
-  delete obj.exchange
+  if (!isObject(obj)) {
+    return
+  }
+
+  const obj_ = obj as any
+  delete obj_.order
+  delete obj_.return
+  delete obj_.claim
+  delete obj_.exchange
 }
 
 function formatOrderReturn(orderReturn, mainOrder) {