improve query performance

src/permit/permit.service.ts

@@ -22,9 +22,9 @@ export async function getPermit(permitId: string, tenantId: string) {
     .findOne({
       $and: [{ tenantId: tenantId }, { pid: permitId }],
     })
-    .populate("county")
-    .populate("client")
-    .populate("assignedTo");
+    .populate({ path: "county", select: "pid name avatar" })
+    .populate({ path: "client", select: "pid name avatar" })
+    .populate({ path: "assignedTo", select: "pid name avatar" });
 }
 
 export async function listPermits(params: PageQueryParams, tenantId: string) {
@@ -55,7 +55,7 @@ export async function listPermits(params: PageQueryParams, tenantId: string) {
     },
     {
       $lookup: {
-        from: "permits",
+        from: "users",
         localField: "assignedTo",
         foreignField: "_id",
         as: "assignedRec",
@@ -63,15 +63,47 @@ export async function listPermits(params: PageQueryParams, tenantId: string) {
     },
     {
       $project: {
-        _id: 0,
+        _id: 1,
         pid: 1,
         permitNumber: 1,
-        county: { $arrayElemAt: ["$countyRec", 0] },
-        client: { $arrayElemAt: ["$clientRec", 0] },
         permitDate: 1,
         stage: 1,
         status: 1,
-        assignedTo: { $arrayElemAt: ["$assignedRec", 0] },
+        county: {
+          $let: {
+            vars: { county: { $arrayElemAt: ["$countyRec", 0] } },
+            in: {
+              _id: "$$county._id",
+              pid: "$$county.pid",
+              name: "$$county.name",
+              type: "$$county.type",
+              avatar: "$$county.avatar",
+            },
+          },
+        },
+        client: {
+          $let: {
+            vars: { client: { $arrayElemAt: ["$clientRec", 0] } },
+            in: {
+              _id: "$$client._id",
+              pid: "$$client.pid",
+              name: "$$client.name",
+              type: "$$client.type",
+              avatar: "$$client.avatar",
+            },
+          },
+        },
+        assignedTo: {
+          $let: {
+            vars: { assigned: { $arrayElemAt: ["$assignedRec", 0] } },
+            in: {
+              _id: "$$assigned._id",
+              pid: "$$assigned.pid",
+              name: "$$assigned.name",
+              avatar: "$$assigned.avatar",
+            },
+          },
+        },
       },
     },
     {
@@ -112,9 +144,9 @@ export async function updatePermit(
       { ...input, updatedAt: new Date() },
       { new: true }
     )
-    .populate("county")
-    .populate("client")
-    .populate("assignedTo");
+    .populate({ path: "county", select: "pid name avatar" })
+    .populate({ path: "client", select: "pid name avatar" })
+    .populate({ path: "assignedTo", select: "pid name avatar" });
 
   return updatePermitResult;
 }