export class Container{
   data:string="";
   testList:Test[];
}

export class Test {
   moredata:string="";
   fileList:File[];
}

export class File {...}

/*************** mongoose schemas **************/
// item.js
var mongoose = require('mongoose');
module.exports = mongoose.model('Item', {
    Content : {type : Object, default: ''}
});

 // file.js
var mongoose = require('mongoose');
var Item = require('./item');
var schema = new mongoose.Schema({
    Data : {type : String, default: ''},
    ItemList: {type: [Item], default:[]}
});

// test.js
var mongoose = require('mongoose');
var File = require('./file');

var schema = new mongoose.Schema({
    Data: {type:String},
    FileList: {type:[File], default:[]}
});

// container.js
var mongoose = require('mongoose');
var Test = require('./test');
var schema = new mongoose.Schema({
    Name : {type : String, default: '', index:true, unique:true, required: true, dropDups:true},
    Test : {type:[Test], default:[]}
});

/*************** nodejs **************/
app.post('/api/container', bodyParser.urlencoded({extended:true}), bodyParser({limit:'50mb'}), bodyParser.json(), function(req, res) {

    var test = req.body._test;

    var testList = [];
    var fileList;
    var itemList;
    var itemObj;
    var fileObj;
    var testObj;

    for(var i in test){
        fileList = [];

        for(var j in test[i]._fileList){
            itemList = [];

            for(var k in test[i]._fileList[j]._itemList){
                itemObj = new Item({
                    Content : test[i]._fileList[j]._itemList[k]._content
                });
                itemList.push(itemObj);
                console.log('item pushed : ' + itemObj + ' and length : ' + itemList.length);
                // logs gives info OK.
            }

            fileObj = new File({
                Data: locales[i]._fileList[j]._data,
                ItemList: itemList
            });
            fileList.push(fileObj);
            console.log('file pushed : ' + fileObj);
            // logs gives info NOK. The ItemList is empty : [], instead of a 70+ item list.
        }
        testObj = new Test({
            Data: locales[i]._data,
            FileList: fileList
        });
        testList.push(testObj);
        console.log('test pushed : ' + i);
        // once again, logs are NOK : the FileList is empty : []
    }

    // use mongoose to save the project in the database
    new Container({
        Name : req.body._name.toLowerCase().trim(),
        Test: testList
    }).save(function(err, container, count){
        if(err){
            console.log('erreur : ');
            console.log(err);

            // we enter here as we have this error :
            /*
            { [CastError: Cast to undefined failed for value "
                {
                  _id: 5727ebf95a76ff0011374928,
                  FileList: [],
                  Data: 'data'
                },
                {
                    _id: 5727ebf95a76ff0011374970,
                    FileList: [],
                    Data: 'other data'
                }" at path "Test"]
              message: 'Cast to undefined failed for value "
                { _id: 5727ebf95a76ff0011374928,n  FileList: [],n Data: 'data' },
                { _id: 5727ebf95a76ff0011374970,n  FileList: [],n Data: 'other data'}"
            at path "Test"',
              name: 'CastError',
              type: undefined,
              value: [{"_id":"5727ebf95a76ff0011374928","FileList":[],"Data":"data"},{"_id":"5727ebf95a76ff0
            011374970","FileList":[],"Data":"other data"}],
              path: 'Test' }
            */

            res.status(403).json({error: 'error'});
        } else {
            console.log('saved ! ');
            res.json(container);
        }
    });
});