Re: problem select menu with "optgroups"

this is sql:
-- Table structure for table `cats`
--

CREATE TABLE IF NOT EXISTS `cats` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`title` varchar(255) COLLATE utf8_persian_ci NOT NULL,
`status` int(2) NOT NULL DEFAULT '1',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_persian_ci
AUTO_INCREMENT=4 ;

--
-- Dumping data for table `cats`
--

INSERT INTO `cats` (`id`, `title`, `status`) VALUES
(1, 'cat1', 1),
(2, 'cat2', 1);

-- --------------------------------------------------------

--
-- Table structure for table `subcats`
--

CREATE TABLE IF NOT EXISTS `subcats` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`cat_id` int(11) NOT NULL,
`title` varchar(255) COLLATE utf8_persian_ci NOT NULL,
`status` int(2) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_persian_ci
AUTO_INCREMENT=4 ;

--
-- Dumping data for table `subcats`
--

INSERT INTO `subcats` (`id`, `cat_id`, `title`, `status`) VALUES
(1, 2, 'sub2-1', 0),
(2, 2, 'sub2-2', 0),
(3, 1, 'sub1-1', 0);

and i have 2 controller:
subcats_controller
cats_controller

and my model:

subcat:

var $belongsTo = array(
'Cat' => array(
'className' => 'Cat',
'foreignKey' => 'cat_id',
'conditions' => '',
'fields' => '',
'order' => ''
)
);

cat:

var $hasMany = array(
'Subcat' => array(
'className' => 'Subcat',
'foreignKey' => 'cat_id',
'dependent' => false,
'conditions' => '',
'fields' => '',
'order' => '',
'limit' => '',
'offset' => '',
'exclusive' => '',
'finderQuery' => '',
'counterQuery' => ''
)
);

and in view:
echo $form->input('usercats');

and in subcats_controller:

function usercat() {
$usercats = $this->Subcat->Cat->find('all');
$this->set(compact('usercats'));
}

and i want create this:
<select>
<optgroup label="cat1">
<option value="3">sub1-1</option>
</optgroup>
<optgroup label="cat2">
<option value="1">sub2-1</option>
<option value="2">sub2-2</option>
</optgroup>
</select>

i hope this information can help you,to help me

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