How to redirect in magento

>> Pass the url in this function :

    public function redirect($url)
    {
        return Mage::app()->getFrontController()
                       ->getResponse()
                       ->setRedirect($url);  
    }

Change default sort by order for one category in Magento

>> If you want to change default sort by value "position" to "name", change admin category setting. see the screen-shot.

   

    you can change default direction by providing the following code in Custom Layout Update section in admin category "Custom Design" Tab
    <reference name="product_list_toolbar">
          <action method="setDefaultDirection"><dir>desc</dir></action>
    </reference>

>> Add "created_at" in sort by dropdown.

    update eav_attribute set frontend_label = "Date" where attribute_code = "created_at" AND entity_type_id = 4; // Ensure about the entity_type_id
    update catalog_eav_attribute set used_for_sort_by = 1 where attribute_id = (select attribute_id from eav_attribute where attribute_code = "created_at" AND entity_type_id = 4);
   
    Now You can see the Date in admin default sort by configuration.
    Admin=>System=>Configuration=>Catalog=>Frontend=> change value here "Product Listing Sort by"

>> If you want to add another attribute, go to the attribute setting and set "yes" for use for default sort by, see the screen-shot.

    Admin=>Attributes=>Manage Attributes

add custom product view page for custom product type in magento

>> Suppose you've created a new Product Type "custom". I've posted how to add new product type in magento. You want to use a different template for those product. follow the instruction ::

  You can directly update in the catalog.xml or you can create a custom module by using Module Creator.

<layout>
  <PRODUCT_TYPE_custom>
    <reference name="product.info">
      <action method="setTemplate">
        <template>path/to/your/view.phtml</template>
      </action>
    </reference>
  </PRODUCT_TYPE_custom>
</layout>

How to add custom product type in Magento

>> Basically You can't create a product type from Admin. You need to modify config.xml and sql in your module.

config.xml

<global>
    <catalog>
        <product>
            <type>
                <classified translate="label" module="vendor">
                    <label>Classified</label>
                    <model>vendor/product_type_classified</model>
                    <composite>0</composite>
                    <index_priority>50</index_priority>
                    <is_qty>1</is_qty>
                </classified>
            </type>
        </product>
    </catalog>
</global>

Here classified is my custom product type and vendor is my custom module.

Now you need to update price type attributes for new type : To run your sql file of your module for next time you need to delete the row created for the module "vendor" in core_resource table. We will discuss later for update Sql.
<?php

$installer = $this;
/* @var $installer Mage_Catalog_Model_Resource_Eav_Mysql4_Setup */

$installer->startSetup();

$setup = new Mage_Eav_Model_Entity_Setup('core_setup');

$fieldList = array(
    'price',
    'special_price',
    'special_from_date',
    'special_to_date',
    'minimal_price',
    'cost',
    'tier_price',
    'weight',
    'tax_class_id'
);

// make these attributes applicable to downloadable products
foreach ($fieldList as $field) {
    $applyTo = split(',', $setup->getAttribute('catalog_product', $field, 'apply_to'));
    if (!in_array('classified', $applyTo)) {
        $applyTo[] = 'classified';
        $setup->updateAttribute('catalog_product', $field, 'apply_to', join(',', $applyTo));
    }
}

$installer->endSetup();

?>

How to get attribute set name in Magento

>> $prodAttributeSet = Mage::getModel('eav/entity_attribute_set')->load($_product->getAttributeSetId())->getAttributeSetName();


>> To get the attributeset name in cart page see the following..
app/design/frontend/base/default/template/checkout/cart/item/default.phtml (or in your theme folder.)

Here you can see the cart item object $_item = $this->getItem(); at line 28. Then you have to load the product with product id.
<?php
    $_product = Mage::getModel('catalog/product')->load($_item->getProductId());
    $prodAttributeSet = Mage::getModel('eav/entity_attribute_set')->load($_product->getAttributeSetId())->getAttributeSetName();
?>

Get Product collection in Magento

 There are many way to get product collection.
 >> First preferable way to get Collection of Magento products :

   $visibility = array(
       Mage_Catalog_Model_Product_Visibility::VISIBILITY_BOTH,
       Mage_Catalog_Model_Product_Visibility::VISIBILITY_IN_CATALOG,
       Mage_Catalog_Model_Product_Visibility::VISIBILITY_IN_SEARCH
    );
   $productCollection = Mage::getModel('catalog/product')->getCollection()
                                        ->addAttributeToSelect('id')
                                        ->addAttributeToSelect('name')
                                        ->addAttributeToFilter('visibility' , $visibility);

Mage::getSingleton('catalog/product_status')->addVisibleFilterToCollection($productCollection);
Mage::getSingleton('cataloginventory/stock')->addInStockFilterToCollection($productCollection);

$productCollection->getSelect()->limit(12);

Remove next elements in jQuery

>>  This peace of code will remove Next input fields :

          jQuery("#selector").nextAll('input:hidden').remove();        // Input type "hidden"
          jQuery("#selector").nextAll('input:text').remove();            // Input type "text"

// By the above code All the input field after the selector will remove

          jQuery("#selector").next('input:hidden').remove();        // Input type "hidden"
          jQuery("#selector").next('input:text').remove();            // Input type "text"

// By the above code only the next input field of the selector will remove