php - how to check yii2 relation is exist show controller -

i have user , agency models

user have agency model , can access whit $user->agency

now want check in accessrule when relation is exist show controller if relation null show alert 'user->agency null pealse create agency' , pass user agency controller

in user model have relation :

public function getagency(){     return $this->hasone(agency::classname(),['id'=>'agency_id'])         ->viatable(self::map_table,['user_id'=>'id']); } 

and have accessrule components :

namespace common\components;  use common\models\user;  class accessrule extends \yii\filters\accessrule {      /**      * @inheritdoc      */     protected function matchrole($user)     {         if (empty($this->roles)) {             return true;         }         foreach ($this->roles $role) {              if ($role == '?') {                 if ($user->getisguest()) {                     return true;                 }             }             elseif (!$user->getisguest()) {                   $userobj = user::findone(['id'=>$user->getid()]);                  if ($role == user::agency_user) {                     if ( $userobj->agency_perm >= user::agency_user) {                         return true;                     }                     // check if user logged in, , roles match                 } elseif ($role == user::agency_moderator) {                     if ( $userobj->agency_perm >= user::agency_moderator) {                         return true;                     }                     // check if user logged in, , roles match                 } elseif ($role == user::agency_admin) {                     if ($userobj->agency_perm >= user::agency_admin) {                         return true;                     }                     // check if user logged in, , roles match                 } elseif ($role == user::super_user) {                     if ($userobj->super_user == user::super_user) {                         return true;                     }                     // check if user logged in, , roles match                 } elseif (!$user->getisguest() && $role == $user->identity->role) {                     return true;                 }              }           }          return false;     } } 

and use in controllers :

        'access' => [             'class' => accesscontrol::classname(),             // override default rule config new accessrule class             'ruleconfig' => [                 'class' => accessrule::classname(),             ],             'rules' => [                 [                     'allow' => true,                     'roles' => [                         user::super_user,                     ],                 ],              ],         ], 

in yii access control, can check user access these approaches:

• check in each action (not recommended)
• controller construct() method
• module/app middle-wares

you can check custom access in level, choose grant access or redirect him page.

in third way, can access controller/action name, decide happens.