How To Validate data Without Saving?

You know, CakePHP check data only when you saving:

$this -> User -> save ($this->data)

But if you do not needing to save data?

In this case, you can use this "hint":

if ( $this -> User -> validates ( $this -> data ) )
{
        // OK, good to go

}

else
{
        $this->set( 'data', $this->params['data'] );
        $this->validateErrors( $this->User );
        $this->render();

}

This code snippet made by Devo.