/**
 * Implementando loadModel dentro da ApiHelper
 */
public function _loadModel_($modelClass = null)
{
	if ($modelClass === null) {
		$modelClass = $this->modelClass;
	}

	$this->uses = ($this->uses) ? (array) $this->uses : array();
	if (!in_array($modelClass, $this->uses, true)) {
		$this->uses[] = $modelClass;
	}

	list($plugin, $modelClass) = pluginSplit($modelClass, true);

	$this->{$modelClass} = ClassRegistry::init(array(
		'class' => $plugin . $modelClass, 'alias' => $modelClass
	));
	if (!$this->{$modelClass}) {
		throw new MissingModelException($modelClass);
	}
	return true;
}