Save questions same model - dual

by Rob Carroll

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.2/underscore-min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/0.9.2/backbone-min.js"></script>
<script src="http://wearethoughtfox.com/app-test/Backbone.dualStorage.js"></script>
<button id="btnSave">Next Question</button>

JavaScript

//Same but with dualStorage - not yet working
//https://github.com/nilbus/Backbone.dualStorage


//model for questions
PlayModel = Backbone.Model.extend({});

//model for which questions to use
PlayGameQuestionCount = Backbone.Model.extend({
    defaults: {
        "use": true
    }
});

//Question collection 
var PlayCollection = Backbone.Collection.extend({
    model: PlayModel,
    url: "https://raw.githubusercontent.com/robertocarroll/barjeel-app/master/app/data/questions.json",
     remote: function () {return true;}
});

//define new question collection
var newCollection = new PlayCollection();

// load data
newCollection.fetch({
    success: function (newCollection, response, options) {
        console.log("fetch questions success");

        console.log(newCollection.destroyedModelIds());
        console.log(newCollection.dirtyModels());

    }
});

function getQuestion() {

    var theQuestions = newCollection.dirtyModels()[0].collection;

    //get the IDs of all questions which haven't been used    
    var questions = theQuestions.chain()
        .filter(function (m) {
        return m.get('use')
    })
        .pluck('id')
        .value();

    console.log(questions);

    if (questions.length > 0) {
        // get random ID from question ID array     
        var rand = questions[_.random(questions.length - 1)];

        console.log('chosen ID value: ' + rand);

        //get a model from a collection, specified by ID     
        var currentQuestion = theQuestions.get(rand);
        console.log(currentQuestion);

        //set the status of that question to used
        currentQuestion.set("use", false);
    }
    //if there's not more questions
    else {
        console.log("No more questions");

        //delete models in local 
        _.chain(newCollection.models).clone().each(function (model) {
            console.log('deleting model ' + model.id);
            //  model.set("use", true);
            // model.save();
           ...