sequelize.js - Find by id and return result

Question

I have a function,

var findUserDevice = function(userDeviceId){      var device = db.DeviceUser.find({         where: {             id: userDeviceId         }     }).then(function(device) {         if (!device) {             return 'not find';         }         return device.dataValues;     }); }; 

but this function does not return anything...

var UserDevice = findUserDevice(req.body.deviceUserId); console.log(UserDevice);// undefined 

Answer 1

The operation you are trying to do is async, which means that you need to use a callback. Since sequelize is build on top of Promises, you should actually write your code like this :

var findUserDevice = function(userDeviceId){     // return the promise itself     return db.DeviceUser.find({         where: {            id: userDeviceId         }      }).then(function(device) {         if (!device) {             return 'not find';         }         return device.dataValues;      }); }; 

And later use it like :

findUserDevice(req.body.deviceUserId).then( function(UserDevice) {    console.log(UserDevice); });