Phalcon transaction issue

gistfile1.txt

    for ($i = 0; $i < 5; $i++) {

			echo $i;
			$transaction = $this->transactionManager->get();
			$pub = new Pub();
			$pub->setTransaction($transaction);
			$pub->save();

			$feature = new PubFeature();
			$feature->setTransaction($transaction);
			$feature->save();

			$transaction->commit();
		}