using transactions in cake

hi everyone,

simple question :)
i have a controller function "save" where i save several data for
different models:

if(!empty($ToSave['Address']))
{

$this->User->UserAddress->save($this->data);
}

if(!empty($ToSave['UserTickets']))
{

$this->UserAdditionalInformation->save();

}

and some more saving here...

now I realized that I have no function to react on failed saving. I
read about transactions but I dont know how to apply that to my code.
Do I need to make a commit and rollback after each model saving or is
once enough?

And how can I give the user an ajax like feedback when saving failed?
i dont wanna redirect to a new page and rather show a message in a
popup..

thanks :)

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