php - Yii dropDownList default value -

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i have code:

echo $form->dropdownlist($model,                   'defaultprinterid',                    chtml::listdata(printer::model()->findall(), 'id', 'name'),                    array('prompt' => '-- none--'));

which gives me dropdown list this:

<select id="labeltype_defaultprinterid" name="labeltype[defaultprinterid]">     <option value="">-- none --</option> </select>

however, when form posts, adds value table defaultprinterid 0. instead of that, how make null, since it's nullable field?

in controller, after load attributes $_post

$model->defaultprinterid = $model->defaultprinterid ? $model->defaultprinterid : null;

this changes 0 null otherwise leaves unmodified.


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