CODEWITHSUNDEEP
javascriptnode.jsmongodbmongoose
kumarD
kumarD

Reputation: 592

Cast to undefined failed for value "[object Object]" at path in node.js

I am trying to push a mongoose object into another object, as in Quiz -> Questions(array of questions), here i am trying to push a question object into the questions array after saving the question object. Below is the function which i have written to accomplish the task

function addQuestiontoQuiz(req,res,next){
var q = new question({questionBody:req.body.questionBody,
    options:[req.body.option1,req.body.option2,req.body.option3,req.body.option4],
    answer:req.body.answer
});
q.save(function(err,question){
    if(err){
        res.status(422).send("Problem :"+err.message);
    }else {
        quiz.findOneAndUpdate({quizName:req.params.quizName},{$push:{questions:question}},{upsert:true},function(err){
            if(err){
                res.status(422).send("Problem: "+err.message);
            } else
            {
                res.redirect('/quiz/'+req.params.quizName+'/questions');
            }
        });
    }
});
}

But i am getting the following error while doing this :

Cast to undefined failed for value "[object Object]" at path "questions"

Here is the quiz model 

var question = App.model('question');
var schema = mongoose.Schema({
quizName:{type:String,unique:true,required:true},
questions:[{type:question}]
 });

The question model :

var schema = mongoose.Schema({
questionBody :{type:String,required:true},
options:[String],
numOfOptions:{type:Number},
answer:{type:String,required:true}
 });

I am stuck at this point, please help.

Upvotes: 3

Views: 3373

Answers (1)

gnerkus
gnerkus

Reputation: 12037

The error is a result of the incorrect schema and model definitions.

Schemas should be defined as instances of the mongoose.Schema constructor. Models should be defined with the mongoose.model method which should supplied the schema as a second argument.

You can refactor the Question model definition in this manner:

// Note the use of 'new mongoose.Schema'
var questionSchema = new mongoose.Schema({
  questionBody: {type:String, required:true},
  options: [String],
  numOfOptions: {type:Number},
  answer: {type:String,required:true}
});

// The 'mongoose.model' method should be given the schema definition.
var Question = mongoose.model('Question', questionSchema);

module.exports = Question;

The Quiz model can be defined as such:

var quizSchema = new mongoose.Schema({
  quizName: {type:String,unique:true,required:true},
  // A quiz has many questions.
  questions:[{type: mongoose.Schema.Types.ObjectId, ref: 'Question'}]
});

var Quiz = mongoose.model('Quiz', quizSchema);

module.exports = Quiz;

There is no need to use the $push query operator. Once a quiz instance has been obtained from the findOneAndUpdate command, the question instance can be added directly to the questions array of the quiz instance:

quiz.findOneAndUpdate({quizName:req.params.quizName}, function(err, quiz) {
  if(err) {
    res.status(422).send("Problem: "+err.message);
  } else {
    quiz.questions.push(question);
    res.redirect('/quiz/'+req.params.quizName+'/questions');
  }
});

Upvotes: 2

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