Mongoose, CastError: Cast to Array failed for value when trying to save a model that contains a model

Question

I am trying to create the model for my mongodb database using mongoose. This is what I am trying to do:

var Class = mongoose.model(\'Class\', {className: St         


        

Answer 1

Your model definition is incorrect, you should fix like below.

// var Schema = mongoose.Schema;
var User = mongoose.model('User',{ 
  email: String, 
  classes: [ {type: Schema.Types.ObjectID, ref: 'Class'}] 
});

var Class1 = new Class({/*yourDataWillBeHere*/})

Class1.save(function(err, classData) {
   var User1 = new User({/*YourDataWillBeHere*/})
   User1.classes.push(classData._id);
   User1.save(function(err, userData) {
      //make something with userData object 
   })
})

Then you can get fetched data using with populate() like this

User
.find()
.populate('classes')
.exec()