Backbone.js Model to View Connection

I am a Backbone.js newbie. I was just playing around with it. I would like to know whether the model is related with the View. In the provided todos example, I see in the addOne method, a new View is created and associated with the newly created model and appended.

  window.AppView = Backbone.View.extend({
     // view code
     addOne: function(todo) {
          var view = new TodoView({model: todo});
          this.$("#todo-list").append(view.render().el);
     }
  }

When I tried to do a similar thing, I got an error saying "bind method cannot be found on undefined".

window.TodoView = Backbone.View.extend({

     initialize: function() {
          _.bindAll(this, 'render', 'close');
          this.model.bind('change', this.render); // I got the error at this place. 
          this.model.view = this;
     }
});

In order to solve this, I got to pass the newly created model as a param to the view constructor and I got to do this.model = task inorder to associate it.

window.TodoView = Backbone.View.extend({

     initialize: function(task) {
          _.bindAll(this, 'render', 'close');
          this.model = task
          this.model.bind('change', this.render);// now there is no error
          this.model.view = this;
     }
});

window.AppView = Backbone.View.extend({


   insertTask:function(){
        var newTask, newTaskView;
        newTask = new Task(JSON.parse(xhr));
        Tasks.create(newTask);
        newTaskView = new TaskView({ model: newTask });
        $("#todo_list").append(newTaskView.render().el);
        this.input.val('');
}

});

But the todos example, do not have something like that. How is the new model associated with the new view implicitly in the todos example?

Thanks