choose.js

async.waterfall([
 function(callback){
  queries.getStudentByNIM(nim, function(err, std){
   msg = 'You are choosing ' + lecturerChosen + ' STATUS : PENDING'
   notifLength = std.notifs.length+1
  callback(std[0])
 })
},
 function(callback){
  queries.addNotif(nim, msg, notifLength, function(err){
  callback(null)
 })
},
 function(callback){
  queries.chooseLecturer(nim, lecturerChosen, function(err){
  callback(null)
 })
},
 function(callback){
  lect.getLecturerByUsername(username, function(err, lec){
   nLength = lec.notifs.length
   msgLec = 'You are chosen by '+ nim
  callback(lec[0])
})
}], function(err, results){
    if(!err) res.redirect(baseurl+'/lecturers')
})