Well... It was a little bit difficult but mixing all answers in this post I made it work.
Firstly, you should create a transform for the new type "array":
DS.ArrayTransform = DS.Transform.extend({
deserialize: function(serialized) {
return (Ember.typeOf(serialized) == "array")
? serialized
: [];
},
serialize: function(deserialized) {
var type = Ember.typeOf(deserialized);
if (type == 'array') {
return deserialized
} else if (type == 'string') {
return deserialized.split(',').map(function(item) {
return jQuery.trim(item);
});
} else {
return [];
}
}
});
App.register("transform:array", DS.ArrayTransform);
Now, in your model, just use it as another attr:
App.myModel = Ember.Model.extend({
name : DS.attr('string'),
cont : DS.attr('array')
}
And we are done.
Remember, when adding elements to the array, to use pushObject.
In a controller:
this.get('model.cont').pushObject('new Item');
I hope this helps someone.
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