NodeJS with MySQL - Return blank Array - mysql

Question

I have initialized an array "userTasklist". I have pushed the object in this array in .map function. After .map, I have console this Array but array is blank.
Than I have console the object in .map function and all the value print successfully but in Array there are no value. Don't know why.
exports.allUserList = (req, res) => {
let userID = req.params.userid;
const ghusersQuery = "SELECT user_id, name, employee_code FROM users WHERE under_gh = ?";
conn.query(ghusersQuery, [userID], (err, userdata) => {
if (err) {
res.send({ message: err })
} else {
if (userdata && userdata.length > 0) {
let userTasklist = [];
userdata.map((datauser) => {
var objtask = {};
const userDataQuery = "SELECT * FROM tasklist WHERE user_id = ?";
conn.query(userDataQuery, [datauser.user_id], (errnew, taskdata) => {
if (taskdata && taskdata.length > 0) {
objtask = {
userid: datauser.user_id,
tasklist: taskdata
}
userTasklist.push(objtask);
}
})
})
console.log(userTasklist)
res.send({ message: "user list fetched", userdata: userdata, tasklistdata: userTasklist })
} else {
res.send({ message: "Data not found!" })
}
}
})
}

Answer 1

Simplified solution using mysql21 for handling queries as Promises.
exports.allUserList = async (req, res) => {
const { userid } = req.params
const users = await connection.query('SELECT user_id, name, employee_code FROM users WHERE under_gh = ?', [userid])
if (!users.length)
return res.send({ message: "Data not found!" })
// better fetch all relevant tasks in bulk
const tasks = await connection.query('SELECT * FROM tasklist WHERE user_id IN (?)', [users.map(r => r.user_id)])
res.send({ message: "user list fetched", users, tasks })
}