Problems with Accessing Attributes from a Backbone.js Model

I have a JSON File looking like this:

JSON :

{

 "clefs": [ 

           {"title": "..", "path": ".."},

           ... , 

           {"title": "..", "path": ".."}

          ],



  ....



 "rests": [ 

           {"title": "..", "path": ".."}, 

           ... , 

           {"title": "..", "path": ".."}

          ]



}

This is a nested JSON, right? So I try to convert that into Model/Collections nested into Backbone.js like this:

Backbone.js :

window.initModel = Backbone.Model.extend({

  defaults: {

    "title": "",

    "path": ""

  }

});



window.CustomCollection = Backbone.Collection.extend({

  model: initModel

});



window.Init = Backbone.Model.extend({

  url : function(){

  return  "/api/data.json"      

},



parse: function(response) {



  clefs = new CustomCollection();

  clefs.add(response.clefs);        

  this.set({clefs: clefs});



  .....



  rests = new CustomCollection();

  rests.add(response.rests);        

  this.set({rests: rests});

} 

});

Now I came out with a Model and into its Attributes my Collection: clefs, ..., rests.

When it's come to pass my Collection to a View I cannot!

I made this

View :

$(document).ready(function() {

  var AppRouter = Backbone.Router.extend({

  routes: {

    ""  : "init"

  },



  init: function(){

  this.init = new Init();



  //this.init.attributes return the Collections: clefs, ..., rests into an object(firebug)



  this.initView = new InitView({collection: this.init.get("rests") });//dont work

  //this.initView = new InitView({collection: this.init.get(rests) });//dont work

  //this.initView = new InitView({collection: this.init.attributes });//dont work

  //this.initView = new InitView({collection: this.init.attributes['clefs'] });//dont work

  this.init.fetch();



 }

});



var app = new AppRouter();

Backbone.history.start();

});

It's an ugly situation right now!! I have a Backbone Model with Attributes(Collections) but I can't extract these Attributes, I try with JSON(), get, _.each, _.map but no success !