symfony - symfony2 FOSUserBundle generate alphanumeric username -

in symfony project have different types of users: 2 admin accounts ids 1 , 2 , username can 100 account company ids of 3-102 , username must aa001 aa100 , accounts ordinary users username aa101, aa102, ...

the 2 admin accounts , accounts of company create symfony command generate them.

my question how generate user name others use registration form first register username aa101 , on

my first idea : recover id max (maxid) , use ($username = 'aa'.maxid-1) happens if 2 users register @ same time

second idea : persist entity , id (afterpersist events) , use ($username = 'aa'.id-2) method avoids risk of having same user name both accounts put in username before persist

i don't know start , method best. advice or idea helpful

ps:sorry english

my solution now

the user class

<?php namespace fm\fmbundle\entity;  use doctrine\orm\mapping orm; use fos\userbundle\model\user baseuser;  /**  * @orm\entity  * @orm\table(name="fos_user")  */ class users extends baseuser {     /**      * @orm\id      * @orm\column(type="integer")      * @orm\generatedvalue(strategy="auto")      */     protected $id;      public function __construct()     {         parent::__construct();         // own logic     }      public function setemail($email){         parent::setemail($email);         parent::setusername($email);     } } 

the post persist event listener

<?php namespace fm\fmbundle\eventlistener; use doctrine\orm\event\lifecycleeventargs; use doctrine\orm\event\postflusheventargs;  class userpostpersistlistener {     private $needsflush;     public  function __construct(){         $this->needsflush=false;     }      public function postpersist(lifecycleeventargs $args)     {         $user = $args->getentity();         $em = $args->getentitymanager();         if($user instanceof users) {             $number=$user->getid()-2;             $user->setusername('aa'.$number);         }          $em->persist($user);         $this->needsflush = true;     }      public function postflush(postflusheventargs $eventargs)     {         if ($this->needsflush) {             $this->needsflush = false;             $eventargs->getentitymanager()->flush();         }     } } 

app/config/service.yml

fmarketuserpostpersistlistner:         class: fm\fmbundle\eventlistener\userpostpersistlistener         tags:             - { name: doctrine.event_listener, event: postpersist } 

app/config/security.yml

providers:         fos_userbundle:             id: fos_user.user_provider.username_email 

but no thing happen username still same user email, when replace

if($user instanceof users) {             $number=$user->getid()-2;             $user->setusername('aa'.$number);         } 

by

$number=$user->getid()-2; $user->setusername('aa'.$number); 

it work fine

i tried before if

dump(get_class($user)); dump($user instanceof users); die; 

it give

userpostpersistlistener.php on line 17: "fm\fmbundle\entity\users" userpostpersistlistener.php on line 18: false 

my question why class name of $user users not instance of users? , without if statement code executed every entity