fix: assignedTo field in the response of payment list is object instead of an array

src/payments/payments.service.ts

@@ -90,12 +90,14 @@ export async function listPayments(
         fileId: 1,
         paymentDate: 1,
         assignedTo: {
-          $let: {
+          $map: {
-            vars: { assignedTo: { $arrayElemAt: ["$assignedTo", 0] } },
+            input: "$assignedTo",
+            as: "user",
             in: {
-              _id: "$$assignedTo._id",
+              _id: "$$user._id",
-              pid: "$$assignedTo.pid",
+              pid: "$$user.pid",
-              name: "$$assignedTo.name",
+              name: "$$user.name",
+              avatar: "$$user.avatar",
             },
           },
         },