add filter on custom module collection

$collection  = Mage::getModel("seller/seller")->getCollection()->addFieldToFilter('email',$email);

Dispatch event

Suppose I like to add an event on payment save

do not add code in core file add it in overwrite file this is just an example

then i will add this code

magento\app\code\core\Mage\Checkout\controllers\OnepageController.php" 

on savePaymentAction function

 Mage::dispatchEvent('on_payment_methode_save', array('data' => $data));

 public function savePaymentAction()

    {

        if ($this->_expireAjax()) {

            return;

        }

        try {

            if (!$this->getRequest()->isPost()) {

                $this->_ajaxRedirectResponse();

                return;

            }

   

   

            $data = $this->getRequest()->getPost('payment', array());

            $result = $this->getOnepage()->savePayment($data);

    Mage::dispatchEvent('on_payment_methode_save', array('data' => $data)); 

            // get section and redirect data

            $redirectUrl = $this->getOnepage()->getQuote()->getPayment()->getCheckoutRedirectUrl();

            if (empty($result['error']) && !$redirectUrl) {

                $this->loadLayout('checkout_onepage_review');

                $result['goto_section'] = 'review';

                $result['update_section'] = array(

                    'name' => 'review',

                    'html' => $this->_getReviewHtml()

                );

            }

            if ($redirectUrl) {

                $result['redirect'] = $redirectUrl;

            }

        } catch (Mage_Payment_Exception $e) {

            if ($e->getFields()) {

                $result['fields'] = $e->getFields();

            }

            $result['error'] = $e->getMessage();

        } catch (Mage_Core_Exception $e) {

            $result['error'] = $e->getMessage();

        } catch (Exception $e) {

            Mage::logException($e);

            $result['error'] = $this->__('Unable to set Payment Method.');

        }

        $this->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));

    }

now  add an event in your config XML file

<events>

 <on_payment_methode_save>

    <observers>

     <Company_Module_Model_Observer>

      <class>Company_Module_Model_Observer</class>

      <method>onPaymentSave</method>

     </Company_Module_Model_Observer>

    </observers>

    </on_payment_methode_save>

  </events>

and further in your Model/observer.php file

public function orderGridLodBefore(Varien_Event_Observer $observer){

    $event = $observer->getEvent()->getData();

}

override adminhtml block magento

Go to custom module config.xml

this will overrite Mage/adminhtml/block/customer/group/edit/form.php
<config>
     <global>
              <blocks>
            <adminhtml>
                <rewrite><customer_group_edit_form>Bill_Checked_Block_Adminhtml_Customer_Group_Edit_Form</customer_group_edit_form>
                </rewrite>
            </adminhtml>
        </blocks>
     </global>
</config>





then create file in   app\code\local\Package\Module\Block\Adminhtml\Customer\Group\Edit\Form.php


use code


class Package_Module_Block_Adminhtml_Customer_Group_Edit_Form extends Mage_Adminhtml_Block_Customer_Group_Edit_Form
{
    protected function _prepareLayout()
    {
     ///Youre code is here
     }
}

Add multiple product images Magento

$newProduct = Mage::getModel(''catalog/product'')->load(productid)
$artworkhid = "image1.jpg,image2.jpg,image3.jpg";
$newProduct->setMediaGallery (array('images'=>array (), 'values'=>array ()));
$imgs = explode(',',$artworkhid);
 $i = 1;
foreach($imgs as $ims){
$previewImage = '/image_path/'.$ims;
     if(file_exists($previewImage)){
 if($i==1){
            $newProduct->addImageToMediaGallery ($previewImage, array ('thumbnail','small_image','image'), false, false);
      }else{
            $newProduct->addImageToMediaGallery ($previewImage, null, false, false);
  }
 $i++;
 }
}

change page title magento

$this->getLayout()->getBlock('head')->setTitle($this->__('pagetitle'));

magento basics concept

Magento built in zend framework on object orient concept in MVC architecture Based on EDA(Event Driven Architecture).
Whent an event happens element listen event and sent to event engine.  

Index management magento programmatically

get All Index process collection

$allIndex= Mage::getSingleton('index/indexer')->getProcessesCollection();

foreach ($allIndex as $index) {
if ($index->getStatus() == Mage_Index_Model_Process::STATUS_REQUIRE_REINDEX) {
$index->reindexEverything();
//echo "<pre>"; print_r($index->getProcess_id()); echo "</pre>";
}
}

get payment method in cart magento

for handling payment method display in cart we use event handling  we use config.xml in module or in custom module

app/code/local/regitration/field/etc/config.xml

<?xml version="1.0"?>
<config>
<frontend>
<events>
    <payment_method_is_active>
        <observers>
            <Regitration_Field_Model_observer>
                <class>Regitration_Field_Model_observer</class>
                <method>payment_method_is_active</method>
            </Regitration_Field_Model_observer>
        </observers>
    </payment_method_is_active>
</events>
  </frontend>
</config>



define action in observer file


app/code/local/regitration/field/model/observer.php

<?php
class Regitration_Field_Model_observer {

public function payment_method_is_active($observer){
     $event           = $observer->getEvent();
    $method          = $event->getMethodInstance();
    $result          = $event->getResult();
    $session = Mage::getSingleton('checkout/session')->getQuote();
$shippiingcarriers =  $session->getShippingAddress()->getShippingMethod();
            if ($shippiingcarriers == 'flatrate_flatrate' ){
                    if($method->getCode() == 'cashondelivery' OR $method->getCode() == 'checkmo' OR $method->getCode() == 'paypal_standard' or $method->getCode()=='purchaseorder'){
                        $result->isAvailable = false;
                    }else{
                        $result->isAvailable = true;
                }
            }

}
}
 ?>

get cross cell product collection magento

$cart = Mage::getModel('checkout/cart')->getQuote();
$productid = array();
$crossc = array();
foreach ($cart->getAllItems() as $item) {
    $productid[] = $item->getProduct()->getId();
foreach($item->getProduct()->getCrossSellProducts() as $crosscell){
$crossc[] = $crosscell['entity_id'];
}
}
$crossce = array_diff($crossc, $productid);
$collection = Mage::getResourceModel('catalog/product_collection')->addAttributeToSelect('*');
$collection->addIdFilter($crossce);
$collection->setPageSize(4);

upcell product collection magento

$pid = 2;
$product = Mage::getModel('catalog/product')->load($pid);
$collect = $this->getProduct()->getUpSellProductCollection();
$collect->getItems();