How to exclude some fields from the document

Question

I have the following simple shema:

 var userSchema = new Schema({     name : String,    age: Number,    _creator: Schema.ObjectId   });    var User = mongoose.model('User',userSchema); 

What I want to do is create the new document and return to client, but I want to exclude the 'creator' field from one:

app.post('/example.json', function (req, res) {    var user = new User({name: 'John', age: 45, _creator: 'some ObjectId'});    user.save(function (err) {       if (err) throw err;        res.json(200, {user: user});     // how to exclude the _creator field?    }); }); 

At the end I want to send the new created user without _creator field:

{    name: 'John',    age: 45 }  

Is it possible to make without extra find request to mongoose?

P.S:It's preferable to make it by

Answer 1

Another way to handle this on the schema level is to override toJSON for the model.

UserSchema.methods.toJSON = function() {   var obj = this.toObject()   delete obj.passwordHash   return obj } 

I came across this question looking for a way to exclude password hash from the json i served to the client, and select: false broke my verifyPassword function because it didn't retrieve the value from the database at all.

Answer 2

The documented way is

UserSchema.set('toJSON', {     transform: function(doc, ret, options) {         delete ret.password;         return ret;     } }); 

UPDATE - You might want to use a white list:

UserSchema.set('toJSON', {     transform: function(doc, ret, options) {         var retJson = {             email: ret.email,             registered: ret.registered,             modified: ret.modified         };         return retJson;     } });