Limit the query select on deleteExpired. Fixes #13

Author: Luca Degasperi

src/LucaDegasperi/OAuth2Server/Repositories/FluentSession.php

@@ -180,6 +180,7 @@ public function deleteExpired()
     {
         $time = time();
         $expiredSessions = DB::table('oauth_sessions')
+                            ->select(array('oauth_sessions.id as session_id'))
                             ->join('oauth_session_access_tokens', 'oauth_session_access_tokens.session_id', '=', 'oauth_sessions.id')
                             ->leftJoin('oauth_session_refresh_tokens', 'oauth_session_refresh_tokens.session_access_token_id', '=', 'oauth_session_access_tokens.id')
                             ->where('oauth_session_access_tokens.access_token_expires', '<', $time)
@@ -193,7 +194,7 @@ public function deleteExpired()
         } else {
             foreach ($expiredSessions as $session) {
                 DB::table('oauth_sessions')
-                    ->where('id', '=', $session->id)
+                    ->where('id', '=', $session->session_id)
                     ->delete();
             }