向一个角色添加多个权限委托Laravel 5的基于角色的权限

I just add entrust to Laravel project, i can create role, create permission , attachPermission, assignRole.

Now i want to attach multiple permissions to one Role ,for example i add this permissions [create-user,edit-user,remove-user,update-user] to superAdmin Role.

public function attachPermission(Request $request){
        $role = Role::where('name', '=', $request->input('role'))->first();
        $permission = Permission::where('name', '=', $request->input('name'))->first();
        foreach ($permission as $pers){
            $role->attachPermissions($pers);
        }
            return response()->json("done");
    }

This code take last just permission, this is a backend i test with Postman.
So what's the best why to do it ? and thanks for help .