How to rewrite Magneto core classes??
- Step 1. Create global configuration File
- Step 2. Create module configuration file
- Step 3. Create new helper class
- Step 4. Create new Model class
- Step 5. Create new Block class
Step 1. Each Module should have one Namespace & Module name. Name space could be some company name etc. & module name should be something that represents module functionality. So let suppose Namespace is ExtendTree and Module name is RewriteClasses Now Create Global Configuration File inside root directory /app/etc/modules as name "ExtendTree_RewriteClasses.xml"
<![CDATA[
<!--xml version="1.0" encoding="UTF-8"?-->
<config>
<modules>
<ExtendTree_RewriteClasses>
<active>true</active>
<codePool>local</codePool>
</ExtendTree_RewriteClasses>
</modules>
</config>
]]>
Step 2. Now Create Module Configuration File inside the directory /app/code/local/ExtendTree/RewriteClasses /etc as name "config.xml"
<![CDATA[
<!--xml version="1.0"?-->
<config>
<modules>
<ExtendTree_RewriteClasses>
<version>0.0.1</version>
</ExtendTree_RewriteClasses>
</modules>
<global>
<blocks>
<!--Admin Sales Order Grid Block-->
<adminhtml>
<rewrite>
<sales_order_grid>ExtendTree_RewriteClasses_Block_Sales_Order_Grid</sales_order_grid>
</rewrite>
</adminhtml>
<!--Admin Sales Order Grid Block-->
</blocks>
<models>
<!--Customer Address Region Collection Model-->
<adminhtml>
<rewrite>
<customer_renderer_region>ExtendTree_RewriteClasses_Model_Customer_Renderer_Region</customer_renderer_region>
</rewrite>
</adminhtml>
<!--Customer Address Region Collection Model-->
</models>
<!--Product Attributes Helper-->
<helpers>
<adminhtml>
<catalog_product_edit_action_attribute>
<data>ExtendTree_RewriteClasses_Catalog_Product_Edit_Action_Attribute</data>
</catalog_product_edit_action_attribute>
</adminhtml>
</helpers>
<!--Product Attributes Helper-->
</global>
</config>
]]>
Step 3. Now create the helper class. Suppose we want to rewrite class Mage_Adminhtml_Helper_Catalog_Product_Edit_Action_Attribute then we will create one helper class in our module in directory app/code/local/ExtendTree/RewriteClasses/Helper/Catalog/Product/Edit/Action/ by name Attribute.php
<![CDATA[
class ExtendTree_RewriteClasses_Helper_Catalog_Product_Edit_Action_Attribute extends Mage_Adminhtml_Helper_Catalog_Product_Edit_Action_Attribute {
/**
* Selected products for mass-update
*
* @var Mage_Catalog_Model_Entity_Product_Collection
*/
protected $_products;
/**
* Array of same attributes for selected products
*
* @var Mage_Eav_Model_Mysql4_Entity_Attribute_Collection
*/
protected $_attributes;
/**
* Excluded from batch update attribute codes
*
* @var array
*/
protected $_excludedAttributes = array('url_key');
/**
* Return product collection with selected product filter
* Product collection didn't load
*
* @return Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collection
*/
public function getProducts() {
if (is_null($this->_products)) {
$productsIds = $this->getProductIds();
if (!is_array($productsIds)) {
$productsIds = array(0);
}
$this->_products = Mage::getResourceModel('catalog/product_collection')
->setStoreId($this->getSelectedStoreId())
->addIdFilter($productsIds);
}
return $this->_products;
}
/**
* Return array of selected product ids from post or session
*
* @return array|null
*/
public function getProductIds() {
$session = Mage::getSingleton('adminhtml/session');
if ($this->_getRequest()->isPost() && $this->_getRequest()->getActionName() == 'edit') {
$session->setProductIds($this->_getRequest()->getParam('product', null));
}
return $session->getProductIds();
}
/**
* Return selected store id from request
*
* @return integer
*/
public function getSelectedStoreId() {
return (int) $this->_getRequest()->getParam('store', Mage_Core_Model_App::ADMIN_STORE_ID);
}
/**
* Return array of attribute sets by selected products
*
* @return array
*/
public function getProductsSetIds() {
return $this->getProducts()->getSetIds();
}
/**
* Return collection of same attributes for selected products without unique
*
* @return Mage_Eav_Model_Mysql4_Entity_Attribute_Collection
*/
public function getAttributes() {
if (is_null($this->_attributes)) {
$this->_attributes = Mage::getSingleton('eav/config')
->getEntityType(Mage_Catalog_Model_Product::ENTITY)
->getAttributeCollection()
->addIsNotUniqueFilter()
->setInAllAttributeSetsFilter($this->getProductsSetIds());
if ($this->_excludedAttributes) {
$this->_attributes->addFieldToFilter('attribute_code', array('nin' => $this->_excludedAttributes));
}
// check product type apply to limitation and remove attributes that impossible to change in mass-update
$productTypeIds = $this->getProducts()->getProductTypeIds();
foreach ($this->_attributes as $attribute) {
/* @var $attribute Mage_Catalog_Model_Entity_Attribute */
foreach ($productTypeIds as $productTypeId) {
$applyTo = $attribute->getApplyTo();
if (count($applyTo) > 0 && !in_array($productTypeId, $applyTo)) {
$this->_attributes->removeItemByKey($attribute->getId());
break;
}
}
}
}
return $this->_attributes;
}
/**
* Return product ids that not available for selected store
*
* @deprecated since 1.4.1
* @return array
*/
public function getProductsNotInStoreIds() {
return array();
}
}
]]>
Step 4. Now create the model class. Suppose we want to rewrite class Mage_Adminhtml_Model_Customer_Renderer_Region then we will create one model class in our module in directory app/code/local/ExtendTree/RewriteClasses/Model/Customer/Renderer by name Region.php
<![CDATA[
class ExtendTree_RewriteClasses_Model_Customer_Renderer_Region extends Mage_Adminhtml_Model_Customer_Renderer_Region {
/**
* Country region collections
*
* array(
* [$countryId] => Varien_Data_Collection_Db
* )
*
* @var array
*/
static protected $_regionCollections;
public function render(Varien_Data_Form_Element_Abstract $element) {
$html = '<tr>' . "\n";
$countryId = false;
if ($country = $element->getForm()->getElement('country_id')) {
$countryId = $country->getValue();
}
$regionCollection = false;
if ($countryId) {
if (!isset(self::$_regionCollections[$countryId])) {
self::$_regionCollections[$countryId] = Mage::getModel('directory/country')
->setId($countryId)
->getLoadedRegionCollection()
->toOptionArray();
}
$regionCollection = self::$_regionCollections[$countryId];
}
$regionId = intval($element->getForm()->getElement('region_id')->getValue());
$htmlAttributes = $element->getHtmlAttributes();
foreach ($htmlAttributes as $key => $attribute) {
if ('type' === $attribute) {
unset($htmlAttributes[$key]);
break;
}
}
// Output two elements - for 'region' and for 'region_id'.
// Two elements are needed later upon form post - to properly set data to address model,
// otherwise old value can be left in region_id attribute and saved to DB.
// Depending on country selected either 'region' (input text) or 'region_id' (selectbox) is visible to user
$regionHtmlName = $element->getName();
$regionIdHtmlName = str_replace('region', 'region_id', $regionHtmlName);
$regionHtmlId = $element->getHtmlId();
$regionIdHtmlId = str_replace('region', 'region_id', $regionHtmlId);
if ($regionCollection && count($regionCollection) > 0) {
$elementClass = $element->getClass();
$html.= '<td class="label">' . $element->getLabelHtml() . '</td>';
$html.= '<td class="value">';
$html .= '<select id="' . $regionIdHtmlId . '" name="' . $regionIdHtmlName . '" '
. $element->serialize($htmlAttributes) . '>' . "\n";
foreach ($regionCollection as $region) {
$selected = ($regionId == $region['value']) ? ' selected="selected"' : '';
$value = is_numeric($region['value']) ? (int) $region['value'] : "";
$html.= '<option value="' . $value . '"' . $selected . '>'
. Mage::helper('adminhtml')->escapeHtml(Mage::helper('directory')->__($region['label']))
. '</option>';
}
$html.= '</select>' . "\n";
$html .= '<input type="hidden" name="' . $regionHtmlName . '" id="' . $regionHtmlId . '" value=""/>';
$html.= '</td>';
$element->setClass($elementClass);
} else {
$element->setClass('input-text');
$html.= '<td class="label"><label for="' . $element->getHtmlId() . '">'
. $element->getLabel()
. ' <span class="required" style="display:none">*</span></label></td>';
$element->setRequired(false);
$html.= '<td class="value">';
$html .= '<input id="' . $regionHtmlId . '" name="' . $regionHtmlName
. '" value="' . $element->getEscapedValue() . '" '
. $element->serialize($htmlAttributes) . "/>" . "\n";
$html .= '<input type="hidden" name="' . $regionIdHtmlName . '" id="' . $regionIdHtmlId . '" value=""/>';
$html .= '</td>' . "\n";
}
$html.= '</tr>' . "\n";
return $html;
}
}
]]>
Step 5. Now create the Block class. Suppose we want to rewrite class Mage_Adminhtml_Block_Sales_Order_Grid then we will create one block class in our module in directory app/code/local/ExtendTree/RewriteClasses/Block/Sales/Order by name Grid.php
<![CDATA[
class ExtendTree_RewriteClasses_Block_Sales_Order_Grid extends Mage_Adminhtml_Block_Sales_Order_Grid {
public function __construct() {
parent::__construct();
$this->setId('sales_order_grid');
$this->setUseAjax(true);
$this->setDefaultSort('created_at');
$this->setDefaultDir('DESC');
$this->setSaveParametersInSession(true);
}
/**
* Retrieve collection class
*
* @return string
*/
protected function _getCollectionClass() {
return 'sales/order_grid_collection';
}
protected function _prepareCollection() {
$collection = Mage::getResourceModel($this->_getCollectionClass());
$this->setCollection($collection);
return parent::_prepareCollection();
}
protected function _prepareColumns() {
$this->addColumn('real_order_id', array(
'header' => Mage::helper('sales')->__('Order #'),
'width' => '80px',
'type' => 'text',
'index' => 'increment_id',
));
if (!Mage::app()->isSingleStoreMode()) {
$this->addColumn('store_id', array(
'header' => Mage::helper('sales')->__('Purchased From (Store)'),
'index' => 'store_id',
'type' => 'store',
'store_view' => true,
'display_deleted' => true,
));
}
$this->addColumn('created_at', array(
'header' => Mage::helper('sales')->__('Purchased On'),
'index' => 'created_at',
'type' => 'datetime',
'width' => '100px',
));
$this->addColumn('billing_name', array(
'header' => Mage::helper('sales')->__('Bill to Name'),
'index' => 'billing_name',
));
$this->addColumn('shipping_name', array(
'header' => Mage::helper('sales')->__('Ship to Name'),
'index' => 'shipping_name',
));
$this->addColumn('base_grand_total', array(
'header' => Mage::helper('sales')->__('G.T. (Base)'),
'index' => 'base_grand_total',
'type' => 'currency',
'currency' => 'base_currency_code',
));
$this->addColumn('grand_total', array(
'header' => Mage::helper('sales')->__('G.T. (Purchased)'),
'index' => 'grand_total',
'type' => 'currency',
'currency' => 'order_currency_code',
));
$this->addColumn('status', array(
'header' => Mage::helper('sales')->__('Status'),
'index' => 'status',
'type' => 'options',
'width' => '70px',
'options' => Mage::getSingleton('sales/order_config')->getStatuses(),
));
if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/view')) {
$this->addColumn('action', array(
'header' => Mage::helper('sales')->__('Action'),
'width' => '50px',
'type' => 'action',
'getter' => 'getId',
'actions' => array(
array(
'caption' => Mage::helper('sales')->__('View'),
'url' => array('base' => '*/sales_order/view'),
'field' => 'order_id',
'data-column' => 'action',
)
),
'filter' => false,
'sortable' => false,
'index' => 'stores',
'is_system' => true,
));
}
$this->addRssList('rss/order/new', Mage::helper('sales')->__('New Order RSS'));
$this->addExportType('*/*/exportCsv', Mage::helper('sales')->__('CSV'));
$this->addExportType('*/*/exportExcel', Mage::helper('sales')->__('Excel XML'));
return parent::_prepareColumns();
}
protected function _prepareMassaction() {
$this->setMassactionIdField('entity_id');
$this->getMassactionBlock()->setFormFieldName('order_ids');
$this->getMassactionBlock()->setUseSelectAll(false);
if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/cancel')) {
$this->getMassactionBlock()->addItem('cancel_order', array(
'label' => Mage::helper('sales')->__('Cancel'),
'url' => $this->getUrl('*/sales_order/massCancel'),
));
}
if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/hold')) {
$this->getMassactionBlock()->addItem('hold_order', array(
'label' => Mage::helper('sales')->__('Hold'),
'url' => $this->getUrl('*/sales_order/massHold'),
));
}
if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/unhold')) {
$this->getMassactionBlock()->addItem('unhold_order', array(
'label' => Mage::helper('sales')->__('Unhold'),
'url' => $this->getUrl('*/sales_order/massUnhold'),
));
}
$this->getMassactionBlock()->addItem('pdfinvoices_order', array(
'label' => Mage::helper('sales')->__('Print Invoices'),
'url' => $this->getUrl('*/sales_order/pdfinvoices'),
));
$this->getMassactionBlock()->addItem('pdfshipments_order', array(
'label' => Mage::helper('sales')->__('Print Packingslips'),
'url' => $this->getUrl('*/sales_order/pdfshipments'),
));
$this->getMassactionBlock()->addItem('pdfcreditmemos_order', array(
'label' => Mage::helper('sales')->__('Print Credit Memos'),
'url' => $this->getUrl('*/sales_order/pdfcreditmemos'),
));
$this->getMassactionBlock()->addItem('pdfdocs_order', array(
'label' => Mage::helper('sales')->__('Print All'),
'url' => $this->getUrl('*/sales_order/pdfdocs'),
));
$this->getMassactionBlock()->addItem('print_shipping_label', array(
'label' => Mage::helper('sales')->__('Print Shipping Labels'),
'url' => $this->getUrl('*/sales_order_shipment/massPrintShippingLabel'),
));
return $this;
}
public function getRowUrl($row) {
if (Mage::getSingleton('admin/session')->isAllowed('sales/order/actions/view')) {
return $this->getUrl('*/sales_order/view', array('order_id' => $row->getId()));
}
return false;
}
public function getGridUrl() {
return $this->getUrl('*/*/grid', array('_current' => true));
}
}
]]>
That's it..!! This way we can rewrite any core class in our custom module
Thank you..!!
"The easy way for everything."
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