BookStack\Repos\PermissionsRepo::deleteRole PHP Метод

    public function deleteRole($roleId, $migrateRoleId)
    {
        $role = $this->role->findOrFail($roleId);
        // Prevent deleting admin role or default registration role.
        if ($role->system_name && in_array($role->system_name, $this->systemRoles)) {
            throw new PermissionsException('This role is a system role and cannot be deleted');
        } else {
            if ($role->id == setting('registration-role')) {
                throw new PermissionsException('This role cannot be deleted while set as the default registration role.');
            }
        }
        if ($migrateRoleId) {
            $newRole = $this->role->find($migrateRoleId);
            if ($newRole) {
                $users = $role->users->pluck('id')->toArray();
                $newRole->users()->sync($users);
            }
        }
        $this->permissionService->deleteJointPermissionsForRole($role);
        $role->delete();
    }