Here i consider that i need to give a discount when user make a order with prepaid method.
Consider, Bd_Prepaid is a custom module and prepaiddiscount_total is a variable,
First create a simple module
1. etc/modules/Bd_Prepaid
<?xml version="1.0"?>
<config>
<modules>
<Bd_Prepaid>
<active>true</active>
<codePool>local</codePool>
<version>0.1.0</version>
</Bd_Prepaid>
</modules>
</config>
2.Then create a config file with following code
<?xml version="1.0"?>
<config>
<modules>
<Bd_Prepaid>
<version>0.1.0</version>
</Bd_Prepaid>
</modules>
<global>
<helpers>
<prepaid>
<class>Bd_Prepaid_Helper</class>
</prepaid>
</helpers>
<models>
<prepaid>
<class>Bd_Prepaid_Model</class>
<resourceModel>prepaid_mysql4</resourceModel>
</prepaid>
</models>
<resources>
<salesattribute1374123678_setup>
<setup>
<module>Bd_Prepaid</module>
<class>Mage_Sales_Model_Mysql4_Setup</class>
</setup>
<connection>
<use>core_setup</use>
</connection>
</salesattribute1374123678_setup>
<salesattribute1374123678_write>
<connection>
<use>core_write</use>
</connection>
</salesattribute1374123678_write>
<salesattribute1374123678_read>
<connection>
<use>core_read</use>
</connection>
</salesattribute1374123678_read>
</resources>
<events>
<checkout_type_onepage_save_order_after> <!-- identifier of the event we want to catch -->
<observers>
<checkout_type_onepage_save_order_after_prepaiddiscount_handler> <!-- identifier of the event handler -->
<type>model</type> <!-- class method call type; valid are model, object and singleton -->
<class>prepaid/newordertotalobserver</class> <!-- observers class alias -->
<method>savePrepaiddiscountTotal</method> <!-- observer's method to be called -->
<args></args> <!-- additional arguments passed to observer -->
</checkout_type_onepage_save_order_after_prepaiddiscount_handler>
</observers>
</checkout_type_onepage_save_order_after>
<checkout_type_multishipping_create_orders_single> <!-- identifier of the event we want to catch -->
<observers>
<checkout_type_multishipping_create_orders_single_prepaiddiscount_handler> <!-- identifier of the event handler -->
<type>model</type> <!-- class method call type; valid are model, object and singleton -->
<class>prepaid/newordertotalobserver</class> <!-- observers class alias -->
<method>savePrepaiddiscountTotalForMultishipping</method> <!-- observer's method to be called -->
<args></args> <!-- additional arguments passed to observer -->
</checkout_type_multishipping_create_orders_single_prepaiddiscount_handler>
</observers>
</checkout_type_multishipping_create_orders_single>
</events>
<sales>
<quote>
<totals>
<prepaiddiscount_total>
<class>prepaid/quote_address_total_prepaiddiscount</class>
<after>subtotal,freeshipping,tax_subtotal,shipping</after>
<before>grand_total</before>
</prepaiddiscount_total>
</totals>
</quote>
<order_invoice>
<totals>
<prepaiddiscount_total>
<class>prepaid/order_invoice_total_prepaiddiscount</class>
<after>subtotal,freeshipping,tax_subtotal,shipping</after>
<before>grand_total</before>
</prepaiddiscount_total>
</totals>
</order_invoice>
<order_creditmemo>
<totals>
<prepaiddiscount_total>
<class>prepaid/order_invoice_total_prepaiddiscount</class>
<after>subtotal,freeshipping,tax_subtotal,shipping</after>
<before>grand_total</before>
</prepaiddiscount_total>
</totals>
</order_creditmemo>
</sales>
</global>
</config>
3.Then create amysql file to create a order attribute
<?php
$installer = $this;
$installer->startSetup();
$installer->addAttribute("quote_address", "prepaiddiscount_total", array("type"=>"varchar"));
$installer->addAttribute("order", "prepaiddiscount_total", array("type"=>"varchar"));
$installer->endSetup();
4.Then create a observer as used in config file
Like Bd/Prepaid/Model/Newordertotalobserver.php
<?php
class Bd_Prepaid_Model_Newordertotalobserver
{
public function savePrepaiddiscountTotal(Varien_Event_Observer $observer)
{
$order = $observer -> getEvent() -> getOrder();
$quote = $observer -> getEvent() -> getQuote();
$shippingAddress = $quote -> getShippingAddress();
if($shippingAddress && $shippingAddress -> getData('prepaiddiscount_total')){
$order -> setData('prepaiddiscount_total', $shippingAddress -> getData('prepaiddiscount_total'));
}
else{
$billingAddress = $quote -> getBillingAddress();
$order -> setData('prepaiddiscount_total', $billingAddress -> getData('prepaiddiscount_total'));
}
$order -> save();
}
public function savePrepaiddiscountTotalForMultishipping(Varien_Event_Observer $observer)
{
$order = $observer -> getEvent() -> getOrder();
$address = $observer -> getEvent() -> getAddress();
$order -> setData('prepaiddiscount_total', $shippingAddress -> getData('prepaiddiscount_total'));
$order -> save();
}
}
5.Then create a class file to collect the total (Bd/Prepaid/Model/Quote/Address/Total/Prepaiddiscount.php), which inherited from Mage_Sales_Model_Quote_Address_Total_Abstract with following code
<?php
class Bd_Prepaid_Model_Quote_Address_Total_Prepaiddiscount
extends Mage_Sales_Model_Quote_Address_Total_Abstract
{
public function __construct()
{
$this -> setCode('prepaiddiscount_total');
}
/**
* Collect totals information about prepaiddiscount
*
* @param Mage_Sales_Model_Quote_Address $address
* @return Mage_Sales_Model_Quote_Address_Total_Shipping
*/
public function collect(Mage_Sales_Model_Quote_Address $address)
{
parent :: collect($address);
$items = $this->_getAddressItems($address);
if (!count($items)) {
return $this;
}
$quote= $address->getQuote();
//amount definition
$prepaiddiscountAmount = 0.01;
//amount definition
$prepaiddiscountAmount = $quote -> getStore() -> roundPrice($prepaiddiscountAmount);
$this -> _setAmount($prepaiddiscountAmount) -> _setBaseAmount($prepaiddiscountAmount);
$address->setData('prepaiddiscount_total',$prepaiddiscountAmount);
return $this;
}
/**
* Add prepaiddiscount totals information to address object
*
* @param Mage_Sales_Model_Quote_Address $address
* @return Mage_Sales_Model_Quote_Address_Total_Shipping
*/
public function fetch(Mage_Sales_Model_Quote_Address $address)
{
parent :: fetch($address);
$amount = $address -> getTotalAmount($this -> getCode());
if ($amount != 0){
$address -> addTotal(array(
'code' => $this -> getCode(),
'title' => $this -> getLabel(),
'value' => $amount
));
}
return $this;
}
/**
* Get label
*
* @return string
*/
public function getLabel()
{
return Mage :: helper('prepaid') -> __('Prepaid Discount');
}
}
6.Then create a file to add this variable in invoice and an other file to add in memo
as
Bd/Prepaid/Model/Order/Invoice/Total/Prepaiddiscount.php
<?php
class Bd_Prepaid_Model_Order_Invoice_Total_Prepaiddiscount
extends Mage_Sales_Model_Order_Invoice_Total_Abstract
{
public function collect(Mage_Sales_Model_Order_Invoice $invoice)
{
$order=$invoice->getOrder();
$PrepaiddiscountTotal = $order->getPrepaiddiscountTotal();
if ($PrepaiddiscountTotal&&count($order->getInvoiceCollection())==0) {
$invoice->setGrandTotal($invoice->getGrandTotal()+$orderPrepaiddiscountTotal);
$invoice->setBaseGrandTotal($invoice->getBaseGrandTotal()+$orderPrepaiddiscountTotal);
}
return $this;
}
}
Bd/Prepaid/Model/Order/Creditmemo/Total/Prepaiddiscount.php
<?php
class Bd_Prepaid_Model_Order_Creditmemo_Total_Prepaiddiscount
extends Mage_Sales_Model_Order_Creditmemo_Total_Abstract
{
public function collect(Mage_Sales_Model_Order_Creditmemo $creditmemo)
{
return $this;
$order = $creditmemo->getOrder();
$orderPrepaiddiscountTotal = $order->getPrepaiddiscountTotal();
if ($orderPrepaiddiscountTotal) {
$creditmemo->setGrandTotal($creditmemo->getGrandTotal()+$orderPrepaiddiscountTotal);
$creditmemo->setBaseGrandTotal($creditmemo->getBaseGrandTotal()+$orderPrepaiddiscountTotal);
}
return $this;
}
}
7. At last add following code to app\code\core\Mage\Sales\Block\Order\Totals.php
${code}Total=$source->getprepaiddiscountTotal();
if($source->getOrderId()) {
${code}Total=$source->getOrder()->getprepaiddiscountTotal();
}
$this->_totals['prepaiddiscount_total'] = new Varien_Object(array(
'code' => 'prepaiddiscount_total',
'field' => 'prepaiddiscount_total',
'value' => $prepaiddiscountTotal,
'label' => $this->__('Prepaid Discount')
));
And following code to app\code\core\Mage\Adminhtml\Block\Sales\Totals.php
$prepaiddiscountTotal=$this->getSource()->getprepaiddiscountTotal();
if($this->getSource()->getOrderId()) {
$prepaiddiscountTotal=$this->getSource()->getOrder()->getprepaiddiscountTotal();
}
$this->_totals['prepaiddiscount_total'] = new Varien_Object(array(
'code' => 'prepaiddiscount_total',
'value' => $prepaiddiscountTotal,
'base_value'=> $prepaiddiscountTotal,
'label' => $this->__('Prepaid Discount')
));
