php - Symfony3 Entity properties reset to null when flush() -


i have react app symfony api. send data react app symfony api. here code in symfony api

/**      * creates new user entity.      *      * @route("/post", name="user_new")      * @method({"get", "post", "options"})      */     function newaction(request $request ) {          $body = $request->getcontent();         $body = str_replace('"', '"', $body);         $body = json_decode($body,true);         $username = $body['username'];         $user = new user();         $user->setusername($username);         $em = $this->getdoctrine()->getmanager();         $em->persist($user);         $em->flush();          return new response(var_dump($user),200);     }

if comment line 

$em->flush();

this returned var_dump($user) when react app sends "john" username.

object(appbundle\entity\user)#264 (2) {   ["id":"appbundle\entity\user":private]=>   null   ["username":"appbundle\entity\user":private]=>   string(4) "john" }

however $em->flush() there internal server error. here error

[2017-07-28 12:02:56] request.critical: uncaught php exception doctrine\dbal\exception\notnullconstraintviolationexception: "an exception occurred while executing 'insert user (username) values (?)' params [null]: sqlstate[23000]: integrity constraint violation: 1048 column 'username' cannot null" @ c:\xampp\htdocs\simple-api\vendor\doctrine\dbal\lib\doctrine\dbal\driver\abstractmysqldriver.php line 112 {"exception":"[object] (doctrine\dbal\exception\notnullconstraintviolationexception(code: 0): exception occurred while executing 'insert user (username) values (?)' params [null]:\n\nsqlstate[23000]: integrity constraint violation: 1048 column 'username' cannot null @ c:\xampp\htdocs\simple-api\vendor\doctrine\dbal\lib\doctrine\dbal\driver\abstractmysqldriver.php:112, doctrine\dbal\driver\pdoexception(code: 23000): sqlstate[23000]: integrity constraint violation: 1048 column 'username' cannot null @ c:\xampp\htdocs\simple-api\vendor\doctrine\dbal\lib\doctrine\dbal\driver\pdostatement.php:93, pdoexception(code: 23000): sqlstate[23000]: integrity constraint violation: 1048 column 'username' cannot null @ c:\xampp\htdocs\simple-api\vendor\doctrine\dbal\lib\doctrine\dbal\driver\pdostatement.php:91)"} []

this means object has username set john, - when flush - property reset null.

here user entity 

    <?php  namespace appbundle\entity;  use doctrine\orm\mapping orm;  /**  * user  *  * @orm\table(name="user")  * @orm\entity(repositoryclass="appbundle\repository\userrepository")  */ class user {     /**      * @var int      *      * @orm\column(name="id", type="integer")      * @orm\id      * @orm\generatedvalue(strategy="auto")      */     private $id;      /**      * @var string      *      * @orm\column(name="username", type="string", length=255)      */     private $username;       /**      * id      *      * @return int      */     public function getid()     {         return $this->id;     }      /**      * set username      *      * @param string $username      *      * @return user      */     public function setusername($username)     {         $this->username = $username;          return $this;     }      /**      * username      *      * @return string      */     public function getusername()     {         return $this->username;     } }

i have seen other questions before include foreign keys , relationships between tables. don't have this. have entity 1 property. reason be?


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