MongoDB - Error: document must have an _id before saving

Question

I\'ve been struggling so much with this project. I am following a tutorial that is out of date in some areas, for instance their version of Jquery used a totally different f

Answer 1

Try below snippet I wanted to name _id as userId you can do without it as well.

var Schema = mongoose.Schema,
ObjectId = Schema.ObjectId;

var UserSchema = new Schema({
    username: String,
    password: String
});
UserSchema.virtual('userId').get(function(){
    return this._id;
});