Magento Redis read error on connection

Magento read error on connection when using Redis. If you are using Redis as cache in Magento and read timeout is not specified, you may get this error. Below is how it looks in the error report.

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read error on connection

Trace:
#1 lib/Mage/Cache/Backend/Redis.php(210): Credis_Client->hGet('zc:k:0cd_FPC_DE...', 'd')
#2 lib/Zend/Cache/Core.php(303): Mage_Cache_Backend_Redis->load('0cd_FPC_DESIGN_...', false)
#3 lib/Varien/Cache/Core.php(158): Zend_Cache_Core->load('FPC_DESIGN_EXCE...', false, false)
#4 app/code/core/Mage/Core/Model/Cache.php(379): Varien_Cache_Core->load('FPC_DESIGN_EXCE...')
#5 app/code/core/Enterprise/PageCache/Model/Processor.php(185): Mage_Core_Model_Cache->load('FPC_DESIGN_EXCE...')
#6 app/code/core/Enterprise/PageCache/Model/Processor.php(146): Enterprise_PageCache_Model_Processor->_getDesignPackage()
#7 app/code/core/Enterprise/PageCache/Model/Processor.php(108): Enterprise_PageCache_Model_Processor->_createRequestIds()
#8 app/code/core/Mage/Core/Model/Cache.php(703): Enterprise_PageCache_Model_Processor->__construct()
#9 app/code/core/Mage/Core/Model/Cache.php(685): Mage_Core_Model_Cache->_getProcessor('Enterprise_Page...')
#10 app/code/core/Mage/Core/Model/App.php(340): Mage_Core_Model_Cache->processRequest()
#11 app/Mage.php(683): Mage_Core_Model_App->run(Array)
#12 /var/www/source/index.php(87): Mage::run('', 'store')

The solution (atleast for us) was to add a read_timeout config option in app/etc/local.xml where you have configured Redis cache for Magento.

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<cache>
        <backend>Mage_Cache_Backend_Redis</backend>
        <backend_options>
                <server>127.0.0.1</server>
                <port>6379</port>
                <persistent></persistent>
                <database>0</database>
                <password></password>
                <force_standalone>0</force_standalone>
                <connect_retries>1</connect_retries>
                <read_timeout>10</read_timeout><!--add this-->
                <lifetimelimit>57600</lifetimelimit>
                <compress_data>0</compress_data>
        </backend_options>
</cache>

HTH!

Magento enterprise: show top mini cart when product is added to cart

Magento Enterprise comes with a top header mini-cart, which displays all the items with their custom options added to cart, when you click on My Cart in the header. This is a good feature, but what if you want to show this mini-cart each time a product is added, without clicking on that link? I will show you here how to display your mini cart automatically when a product is added to cart.

Open your cartheader.php file, which is located at:
app/design/frontend/enterprise/YOUR_DESIGN/template/checkout/cart/cartheader.phtml

In the last few lines of this file, you should find the below line in javascript:

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Enterprise.TopCart.initialize('topCartContent');
// Below can be used to show minicart after item added
// Enterprise.TopCart.showCart(7);

Replace the last line, //Enterprise.TopCart.showCart(7); with the below lines:

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jQuery( document ).ready(function() {
    if( jQuery('#messages_product_view').children().length ){ 
        if(jQuery('#messages_product_view').children().children().attr('class') == 'success-msg') {
            if(jQuery('.success-msg ul li span').text().indexOf('was added to your shopping cart') > -1) {
                Enterprise.TopCart.showCart(7);
            }
        }
    }
});

So whenever in the page, there will be an element with ID “#messages_product_view” and it has a children with class “success-msg” and it has a ul/li/span with text containing “was added to your shopping cart”, we will show the top mini-cart. This is only true when an product is added to shopping cart.

You can also show top mini-cart without this jquery hack, by making a new module in Magento and catch the event when product is added to cart. Then programmatically clicking the top mini cart to display it. But according to me this small piece of code is better than to create whole new Magento module.

HTH!

Magento remove session id from URL

Magento displays session ID in url, something like:

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http://loca.lho.st?__SID=2wewesfdgfsdm

You can remove this in two ways:

1. Go to your Magento admin panel > System > Configuration > Web.
Under Session Validation Settings, set “No” against label “Use SID on the Frontend”.
If this doesn’t work, then move to option two below.

2. Edit the file at app/code/core/Mage/Core/Model/App.php (somewhere around line 222),

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protected $_useSessionInUrl = true;

Change that value to “false”. That should now prevent session IDs appearing in URL.

Magento Error: Fatal error: Call to a member function rewrite() on a non-object in app/code/core/Mage/Core/Controller/Varien/Front.php on line 165

Magento Error: Fatal error: Call to a member function rewrite() on a non-object in /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Front.php on line 165

While upgrading Magento from 1.7 to 1.8 version, this error generally appears and stops the site from loading.

We can get rid of this error simply by clearing the cache:

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rm -rf var/cache/*

If you don’t have terminal access, clear all the contents of var/cache/ directory.

Further if you have memcached or other caching system installed, flush them as well.

Magento remove reviews and ratings of products

Magento don’t provide admin screen where store owner can delete all the reviews and ratings of the products. The easiest way to delete them is using raw SQL queries, which you can run in Mysql console or in PhpMyAdmin. Remove/delete all the reviews and ratings of products in Magento using simple SQL queries given below.

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truncate table `rating_option_vote`; 
truncate table `rating_option_vote_aggregated`;
truncate table `review`; 
truncate table `review_detail`; 
truncate table `review_entity_summary`; 
truncate table `review_store`;