add search to task

src/task/task.service.ts

@@ -140,3 +140,90 @@ export async function listTasks(params: PageQueryParams, tenantId: string) {
 export async function deleteTask(taskId: string, tenantId: string) {
   return await taskModel.deleteOne({ pid: taskId, tenantId: tenantId });
 }
+
+export async function searchTasks(params: PageQueryParams, tenantId: string) {
+  const page = params.page || 1;
+  const pageSize = params.pageSize || 10;
+  const sortObj = getSortObject(params, taskFields);
+  const filterObj = getFilterObject(params, taskFields);
+
+  const regex = new RegExp(params.searchToken, "i");
+
+  const taskList = await taskModel.aggregate([
+    {
+      $match: { $and: [{ tenantId: tenantId }, ...filterObj] },
+    },
+    {
+      $match: {
+        $or: [{ title: { $regex: regex } }],
+      },
+    },
+    {
+      $lookup: {
+        from: "users",
+        localField: "createdBy",
+        foreignField: "_id",
+        as: "createdBy",
+      },
+    },
+    {
+      $lookup: {
+        from: "users",
+        localField: "assignedTo",
+        foreignField: "_id",
+        as: "assignedTo",
+      },
+    },
+    {
+      $project: {
+        _id: 1,
+        pid: 1,
+        title: 1,
+        dueDate: 1,
+        createdAt: 1,
+        createdBy: {
+          $let: {
+            vars: { createdBy: { $arrayElemAt: ["$createdBy", 0] } },
+            in: {
+              _id: "$$createdBy._id",
+              pid: "$$createdBy.pid",
+              name: "$$createdBy.name",
+            },
+          },
+        },
+        assignedTo: {
+          $let: {
+            vars: { assignedTo: { $arrayElemAt: ["$assignedTo", 0] } },
+            in: {
+              _id: "$$assignedTo._id",
+              pid: "$$assignedTo.pid",
+              name: "$$assignedTo.name",
+            },
+          },
+        },
+      },
+    },
+    {
+      $facet: {
+        metadata: [{ $count: "count" }],
+        data: [
+          { $skip: (page - 1) * pageSize },
+          { $limit: pageSize },
+          { $sort: sortObj },
+        ],
+      },
+    },
+  ]);
+
+  if (taskList[0].data.length === 0)
+    return { tasks: [], metadata: { count: 0, page, pageSize } };
+
+  return {
+    tasks: taskList[0]?.data,
+    metadata: {
+      count: taskList[0].metadata[0].count,
+      page,
+      pageSize,
+    },
+  };
+}