I'm trying to do this With last 2.x CakePHP version, I'm trying to do a 
upload multiple file form with validations but not working...

*DocsController.php (action add)*

if ($this->request->is('post')) {
    if ($this->Doc->saveMany($this->request->data, array('deep' => true))) {
        $this->Session->setFlash(__('Ok'));
    } else {
        debug($this->Doc->validationErrors); die();
        $this->Session->setFlash(__('Error'));
    }
    $this->redirect($this->referer());}

*add.ctp*

<?php
echo $this->Form->create('Doc', array('type' => 'file'));
echo $this->Form->input('files.', array(
    'label' => __("New document",true),    'type' => 'file', 
    'div' => 'input text no',
    'multiple' => 'multiple',
    'required' => true,));
echo $this->Form->end('Upload');?>

*Doc.php*

class Doc extends AppModel {

    public $belongsTo = array(
        'Project' => array(
            'className' => 'Project',
            'foreignKey' => 'project_id',
        )
    );

        public $validate = array(
        'files' => array(
                'rule' => array('extension', array('pdf')),
                'required' => false,
                'allowEmpty' => true,
                'message' => 'Only pdf files'     
        ),
    );}

*Arrays*

*This error is OK:*

Array(
    [Doc] => Array
        (
            [files] => Array
                (
                    [0] => Array
                        (
                            [name] => images.jpeg
                            [type] => image/jpeg
                            [tmp_name] => /private/var/tmp/phpSqerRI
                            [error] => 0
                            [size] => 5740
                        )

                )

        )
)
/app/Controller/DocsController.php (line 112)
array(
    'Doc' => array(
        'files' => array(
            (int) 0 => 'Only pdf files'
        )
    ))

*This is the problem:*

Array(
    [Doc] => Array
        (
            [files] => Array
                (
                    [0] => Array
                        (
                            [name] => 4_54718093804437603.pdf
                            [type] => application/pdf
                            [tmp_name] => /private/var/tmp/phpCfUUDx
                            [error] => 0
                            [size] => 1441232
                        )

                )

        )
)
/app/Controller/DocsController.php (line 112)
array(
    'Doc' => array())

It's PDF, so OK but validation returns array

Why return array if no broke rules??

Thanks in advance, sorry for my english.

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