fix: bugs in taggedUsers filter

src/pagination.ts

@@ -1,5 +1,5 @@
 import { z } from "zod";
-import { parse } from "./utils/queryParser";
+import { MongoFilter, parse } from "./utils/queryParser";
 
 export const pageMetadata = z.object({
   count: z.number(),
@@ -46,3 +46,51 @@ export function getFilterObject(params: PageQueryParams) {
     return parsedQuery;
   }
 }
+
+export function getTaggedUsersFilter(
+  filterObj: MongoFilter[],
+  sortObj: Record<string, 1 | -1>
+) {
+  const taggedUserFilterIndex = filterObj.findIndex((item) =>
+    Object.keys(item).includes("taggedUsers")
+  );
+
+  let taggedFilter = [];
+  if (taggedUserFilterIndex != -1) {
+    const filterItem = filterObj[taggedUserFilterIndex].taggedUsers;
+    let filterValues = null;
+
+    let notFlag = false;
+    if (filterItem["$eq"]) {
+      filterValues = [filterItem["$eq"]];
+    } else if (filterItem["$ne"]) {
+      filterValues = [filterItem["$ne"]];
+      notFlag = true;
+    } else if (filterItem["$in"]) {
+      filterValues = filterItem["$in"];
+    } else {
+      filterValues = filterItem["$nin"];
+      notFlag = true;
+    }
+
+    const condition = notFlag ? { $exists: false } : { $exists: true };
+
+    taggedFilter = [
+      {
+        $addFields: {
+          taggedUsersFilter: {
+            $filter: {
+              input: "$taggedUsers",
+              as: "user",
+              cond: { $in: ["$$user.userId", filterValues] },
+            },
+          },
+        },
+      },
+      { $match: { "taggedUsersFilter.0": condition } },
+      { $sort: { "taggedUsersFilter.taggedAt": sortObj.taggedUsers ?? -1 } },
+    ];
+  }
+
+  return { taggedFilter, taggedUserFilterIndex };
+}