How to make ACS calls atomic?

Hello,

I am currently using the Appcelerator Cloud as backend and I am running into the problem where I need to add new elements to two tables at the same time. For example, I want to create a custom object called cars and a corresponding photo collection of the cars :

Cloud.Objects.create({ classname: 'cars', fields: { make: 'nissan', color: 'blue', year: 2005 } }, function (e) { if (e.success) { var car = e.cars[0]; Cloud.PhotoCollections.create({ name: 'Car Pictures' owner_id: car.id }, function (e) { if (e.success) { var collection = e.collections[0]; alert('Success:\n' + 'id: ' + collection.id + '\n' + 'name: ' + collection.name + '\n' + 'count: ' + collection.counts.total_photos + '\n' 'updated_at: ' + collection.updated_at); } else { alert('Error:\n' + ((e.error && e.message) || JSON.stringify(e))); } });

} else {
    alert('Error:\n' +
        ((e.error && e.message) || JSON.stringify(e)));
}

});

However, this would not work atomically, ie there maybe cases where the cars is created but not the set of photos. Can someone help me?

Thanks, Wentao Ji