php - Symfony3 how to store user roles in database -

symfony version: 3.1.3 database: mysql

i have users table , has column roles(longtext-dc2type:array).

in controller have created dropdown box form bellow,

$user = new users; $form = $this->createformbuilder($user)         // other fields         ->add('roles', choicetype::class, array(                     'attr'  =>  array(                             'class' => 'form-control',                             'style' => 'margin:5px 0;'),                     'choices'  => array(                             'teacher'   => true,                             'student'   => true,                             'parent'    => true                     ),         ) )         // other fields         ->getform(); 

and getting user selected role bellow,(within same controller)

if( $form->issubmitted() && $form->isvalid() ){     // other codes     $role   = $form['roles']->getdata();     // other codes      if( $role == 0 ){         $userrole = array ('teacher');     }     elseif( $role == 1 ){         $userrole = array ('student');     }     elseif( $role == 2 ){         $userrole = array ('parent');     }      $user->addrole($userrole);      $em = $this->getdoctrine()->getmanager();     $em->persist($user);     $em->flush(); } 

but gives me following error,

expected argument of type "array", "boolean" given  

i think doing wrong way , know right way insert roles database.

here did rid issue,

define roles in /app/config/security.yml below,

role_hierarchy:     role_admin:         [role_admin]     role_super_admin:   [role_super_admin, role_allowed_to_switch]     role_teacher:       [role_teacher]     role_student:       [role_student]     role_parent:        [role_parent] 

in controller, roles /app/config/security.yml using following code

$roles = $this->getparameter('security.role_hierarchy.roles');

and code roles in formtype,

$roles = $this->getparent('security.role_hierarchy.roles'); 

and in formtype, (here multi select)

->add('roles', choicetype::class, array(     'attr'  =>  array('class' => 'form-control',     'style' => 'margin:5px 0;'),     'choices' =>      array     (         'role_admin' => array         (             'yes' => 'role_admin',         ),         'role_teacher' => array         (             'yes' => 'role_teacher'         ),         'role_student' => array         (             'yes' => 'role_student'         ),         'role_parent' => array         (             'yes' => 'role_parent'         ),     )      ,     'multiple' => true,     'required' => true,     ) ) 

edit user roles has defined in /app/config/security.yml below

role_hierarchy:     role_admin:         [role_admin]     role_super_admin:   [role_super_admin, role_allowed_to_switch]     role_teacher:       [role_teacher]     role_student:       [role_student]     role_parent:        [role_parent]