Mongoose: error occured at this._schema.caster.cast when using [].push method

[maelfosso]

Hi everybody,

Please I have an error when I try this code s.items.push(_item);
I have two models :

var ItemSchema = new Schema(
    {
        title   : String
    }
);
mongoose.model('Item', ItemSchema)

and

var SurveySchema = new Schema(
    {
        title : {
            type    : String,
            default : 'Title'
        },
        image       : {
            type    : String
        },

        author  : {
            type    : ObjectId,
            ref     : 'User',
            childPath   : 'surveys'
        },
        items   :   [ Item ]
    },
    {
        collection  : 'surveys'
    }
);

That is the error :

/usr/local/lib/node_modules/mongoose/lib/types/array.js:108
  return this._schema.caster.cast(value, this._parent, false)
                             ^
TypeError: Object {} has no method 'cast'
    at Array.MongooseArray._cast (/usr/local/lib/node_modules/mongoose/lib/types/array.js:108:30)
    at Object.map (native)
    at Array.MongooseArray.push (/usr/local/lib/node_modules/mongoose/lib/types/array.js:262:23)
    at /home/mael-fosso/www/questan/node.js/controllers/survey.js:86:25
    at Array.map (native)
    at Promise.<anonymous> (/home/mael-fosso/www/questan/node.js/controllers/survey.js:84:41)
    at Promise.<anonymous> (/usr/local/lib/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)
    at Promise.EventEmitter.emit (events.js:95:17)
    at Promise.emit (/usr/local/lib/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)
    at Promise.fulfill (/usr/local/lib/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)

how to solve it please ?

[vkarpov15]

Can you clarify what version of mongoose you're using and what _item is in your example (preferably with require('util').inspect() output)?

[maelfosso]

The description of _item by using
console.log(util.inspect(_item, {showHidden: true, depth: null})); is

{ title: 'Label', _id: 55185e2fce8f87c67728039d }

The version of mongoose is 3.8.20

Thanks.

[vkarpov15]

So mongoose doesn't support array of models as a schema type. What you need to do is:

var SurveySchema = new Schema(
  // ...
  items:   [ ItemSchema ]
  // ...
);

[jonathansp]

It should work:

    var SurveySchema = new Schema(
        {
            title : {
                type    : String,
                default : 'Title'
            },
            image       : {
                type    : String
            },

            author  : {
                type    : ObjectId,
                ref     : 'User',
                childPath   : 'surveys'
            },
            items   :   [ Item.schema ]    // Gets item schema
        },
        {
            collection  : 'surveys'
        }
    );