private function _getAssociationTables(array $classes)
{
$associationTables = array();
foreach ($classes as $class) {
foreach ($class->associationMappings as $assoc) {
if ($assoc['isOwningSide'] && $assoc['type'] == ClassMetadata::MANY_TO_MANY) {
$associationTables[] = $assoc['joinTable']['name'];
}
}
}
return $associationTables;
}