gistfile1.js

var ItemCollection = Spine.Model.setup("Item", [ "itemToAdd", "items" ]);
ItemCollection.extend(DataBind);

ItemCollection.include({
    addItem: function() {
        if (this.itemToAdd != "") { 
            this.items.push(this.itemToAdd);
            this.itemToAdd = "";
            this.save();
        }
    } 
});

var Item = ItemCollection.create({ itemToAdd: "", items: [ "Alpha", "Beta", "Gamma" ] });