Validation problem

Hi!
I try to create some validation to my form. I followed some forums and blogs looking for solution, but nothing helps.

My controller looks like this:

public function add() {
        if ($this->request->is('post')) {
            $this->Student->create();
            if ($this->Student->validates()) {
.....

And my model validation:

public $validate = array(
         'firstname' => array(
            'alphaNumeric' => array(
                'rule'     => 'alphaNumeric',
                'required'    =>    true,
                'message'  => 'Tylko litery w imieniu'
            ),
            'minLength' => array(
                'rule'    => array('minLength', '3'),
                'required'    =>    true,
                'message' => 'Wpisz pełne imię'
            )
        ), ......

When I remove "required => true" form passes validation even with errors! When I enable "required => true" form fails each time, even when correct. The only field that works correct is email:

'email' => array('email', true),

When I show debug($this->Student->data) all data is there. However I suppose, that somehow validation may be somehow unable to see this.

Please help me find solution to this problem.
Regards,
Slawek.

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