Take a look at the saveAll() method in the Model class, it will handle
validation and saving and transactions.
As far as ajax feedback, something I've done in the past is pass the ajax
response to a function that checks the response for validation errors, then
extract those and output them however I want.
$this->Js->submit('Submit', array('success'=>'onSuccess(event, data,
textStatus)');
then your js may look something like (assuming jquery)
function onSuccess(event, data, textStatus) {
$(data).find('div.error'); // etc.
}
If you use the form helper, it will create a div.error for each validation
error which you can then extract the text from and display however you want.
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