gistfile1.js

Car = Collection.model('Car', {
        id: 'id',
        attributes: ['colour'],
        properties: {
            blah: {
                get: function () {
                    return this.colour ? this.colour.toUpperCase() : this.colour;

                },
                // Workaround for chrome.
                dependencies: ['colour']
            }
        }
    });