php - Extended Session in L5 does not persist between requests -

i extending session provider in order persist required data. started editing appserviceprovider's boot method:

\session::extend('desk', function($app) {     return new desk(); });  

desk class looks like:

namespace app\services;   use illuminate\session\existenceawareinterface;  class desk implements \sessionhandlerinterface, existenceawareinterface{      /**      * existence state of session.       * @var bool      */     protected $exists;      public function close()     {         return true;     }      public function destroy($session_id)     {         $session = $em->find('session', $session_id);         $em->remove($session);         $em->flush();          return true;     }      public function gc($maxlifetime)     {         // todo: implement gc() method.     }      public function open($save_path, $session_id)     {         return true;     }      public function read($session_id)     {         $session = $em->find('session', $session_id);          if ($sesion !== null){             $this->exists = true;             return  $session->getpayload();         }     }      public function write($session_id, $session_data)     {         $session = $em->find('session', $session_id);          if ($session === null){             $session = new session($session_id, $session_data);             $em->persist($session);         }         else{             $session->setpayload($session_data);         }          $em->flush();          $this->exists = true;     }       public function setexists($value)     {         $this->exists = $value;          return $this;     } } 

after finish implementation, changed session config this:

return [     'driver' => 'desk',     'lifetime' => 120,     'expire_on_close' => false,     'encrypt' => false,     'files' => storage_path().'/framework/sessions',     'connection' => null,     'table' => 'sessions',     'lottery' => [2, 100],     'cookie' => 'lote_session',     'path' => '/',     'domain' => null,     'secure' => false, ]; 

when load page there not problem, after success login request , then, refresh page, session expires , user guest again. miss something?

additional information: if revert session driver "file", goes fine.

well, others need/want extends session provider me, pay attention session's table structure. mistake payload column set as:

payload varchar(255) not null 

because of laravel serialization data, payload value has more 255 characters length, in consequence, break data , make inconsistent. can consider:

payload text not null