Vfrdtyky

I'm using Nodejs Express and Mongoose ("mongoose": "^5.3.11",). I'm trying to add some data to a collection. I'm getting all the correct data but when I use $push there is an error "CastError: Cast to embedded failed for value ", I've been looking around for different solutions but I can't figure it out.

this is my Schema

var InstructorSchema= mongoose.Schema({

first_name:{

    type: String

},

last_name:{

    type:String

},

username:{

    type:String

},

email:{

    type:String

},

classes:[{

    class_id:{type:[mongoose.Schema.Types.ObjectId]},

    class_code:{type:String},        

    class_title:{type:String}

}] 

});



 var Instructor = module.exports = mongoose.model('Instructor', InstructorSchema);

Here I collect the data from a form

info=;

info['instructor_ID']=req.user.id;

info['instructor_username']=req.user.username;

info['class_id']=req.body.class_id;

info['class_code']=req.body.class_code;

info['class_title']=req.body.class_title;

This is my data

module.exports.register=function(info,callback){

instructor_ID=info['instructor_ID'];

instructor_username=info['instructor_username'];

class_id=info['class_id'];

class_code=info['class_code'];

class_title=info['class_title'];

Here is the function

var query = {username: instructor_username};

 Instructor.findOneAndUpdate(

    query,

    {

        $push: {

            "classes": {

                class_id: class_id, 

                class_code: class_code, 

                class_title: class_title

                }

        }

    },

    {   safe: true, 

        upsert: true

    },

    callback

    );

This is the error

    CastError: Cast to embedded failed for value "{ class_id: '5be353ead45965c74d9e2853 ',n  class_code: 'ART101 ',n  class_title: 'Arts Fundamentals ' }" at path "classes"

at new CastError (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooseliberrorcast.js:29:11)

at DocumentArray.cast (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibschemadocumentarray.js:349:19)

at DocumentArray.cast (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibschemadocumentarray.js:276:17)

at castUpdateVal (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibhelpersquerycastUpdate.js:365:24)

at walkUpdatePath (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibhelpersquerycastUpdate.js:165:24)

at castUpdate (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibhelpersquerycastUpdate.js:79:18)

at model.Query._castUpdate (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibquery.js:3861:10)

at castDoc (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibquery.js:3889:18)

at model.Query.Query._findAndModify (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibquery.js:3021:19)

at model.Query.Query._findOneAndUpdate (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_modulesmongooselibquery.js:2732:8)

at C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_moduleskareemindex.js:278:20

at _next (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_moduleskareemindex.js:102:16)

at process.nextTick (C:UsersuserDocumentsWeb DevelopmentNodeelearningnode_moduleskareemindex.js:499:38)

at _combinedTickCallback (internal/process/next_tick.js:131:7)

at process._tickCallback (internal/process/next_tick.js:180:9)

Finally, I changed the

class_id:{type:[mongoose.Schema.Types.ObjectId]},

For

class_id:{type: Schema.Types.Mixed},

Now it works

UPDATE:
My class_id had a white space at the end, I don't know exactly why however I removed it using the trim function. After that, the program works correctly using

class_id:{type:[mongoose.Schema.Types.ObjectId]}