AppShell.php

<?php
App::uses('Shell', 'Console');

/**
 * Application Shell
 *
 * Add your application-wide methods in the class below, your shells
 * will inherit them.
 *
 * @package       app.Console.Command
 */
class AppShell extends Shell {

  public function loadModel($modelName) {

		App::uses('ClassRegistry', 'Utility');

		$uses = array($modelName);

		$modelClassName = $uses[0];
		if (strpos($uses[0], '.') !== false) {
			list($plugin, $modelClassName) = explode('.', $uses[0]);
		}
		$this->modelClass = $modelClassName;

		foreach ($uses as $modelClass) {
			list($plugin, $modelClass) = pluginSplit($modelClass, true);
			$this->{$modelClass} = ClassRegistry::init($plugin . $modelClass);
		}

		return true;		
	} 
}