Backbone call a model method from the view - backbone.js

Question

I have a backbone app with require where I want to add a collection inside a collection with a method inside model.
I have tried to insert the method in the collection but I can't add elements.
I'd want to make a collection of app when I click an element outside the app I want add inside my app other app in a collection.
This is my app:
Model:
define(['backbone', 'collections/element'],function(Backbone, ElementCollection){
var DesignModel = Backbone.Model.extend({
initialize:function(){
console.log('Initialized Design model');
_.defaults(this, {
elements: new ElementCollection()
});
},
addElement: function(elements, options) {
return this.elements.add(elements, options);
}
});
return DesignModel;
});
Collection:
define(['backbone', 'models/design'], function(Backbone, DesignModel){
var designCollection = Backbone.Collection.extend({
model: DesignModel,
});
return designCollection;
});
View
define(['jquery' , 'backbone', 'models/design', 'collections/design', 'views/element'],
function($, Backbone, DesignModel, DesignCollection, ElementView){
var DesignView = Backbone.View.extend({
el:$('#page'),
initialize: function(){
console.log('initialize DesignView');
this.collection = new DesignCollection();
var here = this;
$('#insert-dynamic-element').click(function(){
var element = new ElementView();
here.collection.models.addElement(element);
});
},
render: function(){
}
})
return DesignView;
});
I have tried to call the function addElement in this way:
here.collection.models.addElement(element);
and
here.collection.addElement(element);
But always with error that Object has no method addElement
How can I solve this? I want to call the method addElement from the view to add an app inside another app in a collection.
Thanks

Answer 1

The safest way to call the method is to add the method to the collection instead of the Model. Currently the method is available on the Model instance .
So this.collection.models.addElement will not cut it
Collection
define(['backbone', 'models/design'], function(Backbone, DesignModel){
var designCollection = Backbone.Collection.extend({
model: DesignModel,
addElement: function(elements, options) {
return this.add(elements, options);
}
});
return designCollection;
});
View
define(['jquery' , 'backbone', 'models/design', 'collections/design', 'views/element'],
function($, Backbone, DesignModel, DesignCollection, ElementView){
var DesignView = Backbone.View.extend({
el:$('#page'),
initialize: function(){
console.log('initialize DesignView');
this.collection = new DesignCollection();
var here = this;
$('#insert-dynamic-element').click(function(){
var element = new ElementView();
here.collection.addElement(element);
});
},
render: function(){
}
})
return DesignView;
});
If you do not want to move the method from the current model. Then you might have to call a specific model using the index
here.collection.at(0).addElement(element);
But there might be a case when there are no model in the collection and this might lead to a error condition..
here.collection.at(0) && here.collection.at(0).addElement(element);

Answer 2

Well, you need to get a specific model, not the array of them. This seems like an error since you'll be picking a specific model essentially arbitrarily (unless you application has semantics that support this), but this would work:
here.collection.at(0).addElement(element);