/**
* Add a set of new flashcard to the user's deck.
*
* Duplicates and ids that laready exist in the user's deck must
* be checked before (cf. checkSelection()).
*
* @param object $userId
* @param object $newCards
*
* @return array Array of successfully added flashcard ids
*/
public static function addSelection($userId, array $cardSelection)
{
// create new flashcards
$cards = ReviewsPeer::addFlashcards($userId, $cardSelection);
if (count($cards)) {
ActiveMembersPeer::updateFlashcardCount($userId);
}
return $cards;
}