Magento产品增加自定义属性

通过安装脚本进行添加

需要先注册catalog/setup为模块的设置资源，或者直接在设置脚本中实例化他

$installer = Mage::getResourceModel('catalog/setup', 'catalog_setup');

$installer = Mage::getResourceModel('catalog/setup', 'catalog_setup');
$installer->removeAttribute('catalog_product', 'free_trial');
$installer->addAttribute('catalog_product', 'free_trial', array(
    'label' => 'Free Trial',
    'type' => 'int',
    'input' => 'select',
    'source' => 'eav/entity_attribute_source_boolean',
    'visible' => true,
    'required' => false,
    'apply_to' => 'simple,configurable,bundle,grouped',
    'group' => 'General',
    'position' => 10,
));