How To disable the Compiler through code in Magento

How To disable the Compiler through code in Magento

If you face the error :

Fatal error: Class 'Mage_avenues_Model_Mysql4_Setup' not found in 
/public_html/domain.com/includes/src/Mage_Core_Model_Resource_Setup.php
 on line 234

You need to edit following code in /magento-root/index.php at around 
line 43, from this:

/**
 * Compilation includes configuration file
*/
define('MAGENTO_ROOT', getcwd());
$compilerConfig = MAGENTO_ROOT . '/includes/config.php';
if (file_exists($compilerConfig)){
    include $compilerConfig;
}

to this:

/**
 * Compilation includes configuration file
*/
define('MAGENTO_ROOT', getcwd());
/*
$compilerConfig = MAGENTO_ROOT . '/includes/config.php';
if (file_exists($compilerConfig)){
    include $compilerConfig;
}
*/
Now, go to your admin. You would be able to login into backend where you
 can disable or run the compile process as per your requirement. When 
it’s done you can restore the first version of index.php and everything 
will work.