yii\rbac\DbManager::addChild PHP Метод

    public function addChild($parent, $child)
    {
        if ($parent->name === $child->name) {
            throw new InvalidParamException("Cannot add '{$parent->name}' as a child of itself.");
        }
        if ($parent instanceof Permission && $child instanceof Role) {
            throw new InvalidParamException('Cannot add a role as a child of a permission.');
        }
        if ($this->detectLoop($parent, $child)) {
            throw new InvalidCallException("Cannot add '{$child->name}' as a child of '{$parent->name}'. A loop has been detected.");
        }
        $this->db->createCommand()->insert($this->itemChildTable, ['parent' => $parent->name, 'child' => $child->name])->execute();
        $this->invalidateCache();
        return true;
    }

 /**
  * Initial RBAC action
  * @param integer $id Superadmin ID
  */
 public function actionInit($id = null)
 {
     $auth = new DbManager();
     $auth->init();
     $auth->removeAll();
     //удаляем старые данные
     // Rules
     $groupRule = new GroupRule();
     $auth->add($groupRule);
     // Roles
     $student = $auth->createRole('student');
     $student->description = 'Student';
     $student->ruleName = $groupRule->name;
     $auth->add($student);
     $teacher = $auth->createRole('teacher');
     $teacher->description = 'Teacher';
     $teacher->ruleName = $groupRule->name;
     $auth->add($teacher);
     $auth->addChild($teacher, $student);
     $admin = $auth->createRole('admin');
     $admin->description = 'Admin';
     $admin->ruleName = $groupRule->name;
     $auth->add($admin);
     $auth->addChild($admin, $teacher);
     $superadmin = $auth->createRole('superadmin');
     $superadmin->description = 'Superadmin';
     $superadmin->ruleName = $groupRule->name;
     $auth->add($superadmin);
     $auth->addChild($superadmin, $admin);
     // Superadmin assignments
     if ($id !== null) {
         $auth->assign($superadmin, $id);
     }
 }