Multiple schema postgre in codeigniter

Question

i'm trying connect postgre other than public schema using codeigniter 3. i have following code :

$db['default']['hostname'] = "localhost";
$db['default']['port'] = "5432";
$db['default']['username'] = "postgres";
$db['default']['password'] = "12345";
$db['default']['database'] = "db_new";
$db['default']['dbdriver'] = "postgre";
$db['default']['schema'] = 'warehouse';
$db['default']['dbprefix'] = "";
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = "";
$db['default']['char_set'] = "utf8";
$db['default']['dbcollat'] = "utf8_general_ci";
$db['default']['swap_pre'] = "";
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

when I try to run the application, it doesn't even connect to the database. Does codeigniter not support connections between schemas in postgre?