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class Pony extends Model {
    relations() {
        return {
            favorite_food: Backbone.Model,
        };
    }
}

var me = new Pony();
var lasagna = new Backbone.Model({id: 42, name: 'Spinach Lasagna'});
me.set('favorite_food', lasagna);
me.unset('favorite_food');
console.log(me.get('favorite_food').toJSON()); // => {id: 42, name: 'Spinach Lasagna'} instead of undefined