delete-----magento后台数据信息删除----------

在grid里面实现这个方法：
 protected function _prepareMassaction()
    {
        $this->setMassactionIdField('post_id');
        $this->getMassactionBlock()->setFormFieldName('blog');

        $this->getMassactionBlock()->addItem('delete', array(
             'label'    => Mage::helper('gao')->__('Delete'),
             'url'      => $this->getUrl('*/*/massDelete'),
             'confirm'  => Mage::helper('gao')->__('Are you sure?')
        ));

        $statuses = Mage::getSingleton('blog/status')->getOptionArray();

        array_unshift($statuses, array('label'=>'', 'value'=>''));
        $this->getMassactionBlock()->addItem('status', array(
             'label'=> Mage::helper('blog')->__('Change status'),
             'url'  => $this->getUrl('*/*/massStatus', array('_current'=>true)),
             'additional' => array(
                    'visibility' => array(
                         'name' => 'status',
                         'type' => 'select',
                         'class' => 'required-entry',
                         'label' => Mage::helper('blog')->__('Status'),
                         'values' => $statuses
                     )
             )
        ));
        return $this;
    }