Mongoose save() not updating value in an array in database document

Question

I am trying to update a document in a collection (units) using GUI and after it gets updated I want to update the value (user.Units which is an array of Unit names) in collection (users). If the array length is just 1 element it gets updated and also shows up in database and everything works well, but when Array of Units have more than one element , I try to update it through a for loop, it shows it gets updated but when I check the database it is still not updated.

I really can't figure out why its not updating the database when I update the value through a loop.

Whole Edit and update function:-

 edit_unit: function (req, res, next) {     var Data = req.body;      Client_data.Unit.findById(req.params.unitId, function (err, unit) {         var error = false;         if (err) {             error = err;         } else if (!unit) {             error = "FATAL: unable to look up Unit #" + req.params.unitId;         } else {              switch(req.body.name) {                 case 'Icon':                     var Icon = unit.Icon;                      User.find({"Units":Icon}, function (err, users) {                         if (err)                         console.log(err);                          users.forEach(function (u) {                             if (u.Units.length > 1) {                             for (var i = 0; i <= u.Units.length; i++) {                                if(u.Units[i] == Icon) {                                    u.Units[i] = req.body.value;                                }                             }                             }                             else {                                 u.Units = req.body.value;                             }                             u.save(u);                         });                     });                     unit[req.body.name] = req.body.value;                     break;                 case 'Description':                     unit[req.body.name] = req.body.value;                     break;                 default:                     unit[req.body.name] = req.body.value;                     break;             }             var data = JSON.stringify(req.body);             unit.save();              res.writeHead(200, {                 'Content-Length': data.length,                 'Content-Type':  'application/json'             });             res.end(data);         }     }); } 

req.body:-

{ name: 'Icon',   value: 'Health Utility 22c',   pk: '5395ed107cd92dc40eaafb56'  } 

User Schema:-

var userSchema = mongoose.Schema({ UserName:     { type: String, required: true }, Password:     { type: String }, FirstName:    { type: String, required: true }, LastName:     { type: String, required: true }, CompanyName:  { type: String }, PhoneNumber:  { type: Number }, StartDate:    { type: Date,   required: true }, EndDate:      { type: Date,   required: true, default: new Date('9999-12-12')  }, ClientID:     { type: ObjectId, ref: 'Client', default: null }, DepartmentID: { type: ObjectId, ref: 'Department' }, ManagerID:    { type: ObjectId, ref: 'User', default: null}, Units:        [ { type: String, required: true } ], UserList:      { type: Array, default:[]}, Access:    [{ type: String, enum: ['DEMO', 'USER','MANAGER','ADMINISTRATOR','OWNER']}], Credentials:  { type: String }, AFTE:         { type: Number}, SessionID:    { type: String, default: null } }, { safe: true }); 

Answer 1

Maybe notify mongooose the dataset has changed like this :

doc.markModified('pathToYourAttribute')  

From the docs http://mongoosejs.com/docs/schematypes.html

person.anything = { x: [3, 4, { y: "changed" }] };  person.markModified('anything'); 

Hope it helps!