How to add an option into a custom created dropdown-attribute for category in magento

Question

I have created a custom dropdown-attribute for magento category with few option, Now I want to add one more option to this select attribute. Is there any way to do this without deleting the existing attribute.

 $setup = new Mage_Eav_Model_Entity_Setup('core_setup');
 $setup->startSetup();
 $setup->addAttribute('catalog_category', 'price_base_unit', array(
 'group' => 'Order Units',
 'input' => 'select',
 'type' => 'varchar',
 'option' => array ('value' => array(
 'optionone'=> array(
 0 =>'Bag'),
 'optiontwo'=> array(
 0 =>'Kg'),
 'optionthree'=> array(
 0 =>'Piece'),
 'optionfour'=> array(
 0 =>'Sq. ft'),
 'optionfive'=> array(
 0 =>'Cu. ft'),
 'optionsix'=> array(
 0 =>'litre'))),
 'label' => 'Price base unit',
 'backend' => '',
 'visible' => 1,
 'required' => 0,
 'user_defined' => 1,
 'global' => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_GLOBAL,
 ));
 $setup->endSetup();

• Amit Bera: Can you share,custom dropdown-attribute installer code?

Answer 1

Try to use the following code snippet

 $attrModel = Mage::getModel('catalog/resource_eav_attribute')->loadByCode('catalog_category', 'price_base_unit');
 $option['attribute_id'] = $attrModel->getAttributeId();
 $option['value']['new_option'][0] = 'new_option_value';
 $setup = new Mage_Eav_Model_Entity_Setup('core_setup');
 $setup->addAttributeOption($option);