public function beforePrepare(Event $event)
	{
		$command = $event['command'];
		$operation = $command->getOperation();

		if ($command->getName() !== 'updateEntity' && $command->offsetExists('_id') === true) return;

		$operation->addParam(new Parameter(array(
			'name' => 'body_id',
			'location' => 'json',
			'type' => 'string',
			'default' => $command->offsetGet('_id'),
			'static' => true,
			'sentAs' => '_id'
		)));
	}