如何验证来自在Laravel中更新电子邮件的用户的唯一电子邮件？

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class AddUniqueEmailToUsersTable extends Migration
{
    public function up()
    {
        Schema::table('users', function (Blueprint $table) {
            $table->unique('email');
        });
    }

    public function down()
    {
        Schema::table('users', function (Blueprint $table) {
            $table->dropUnique('users_email_unique');
        });
    }
}

use Illuminate\Http\Request;
use App\Models\User;

public function updateEmail(Request $request, User $user)
{
    $request->validate([
        'email' => ['required', 'email', Rule::unique('users')->ignore($user->id)],
    ]);

    $user->email = $request->email;
    $user->save();

    return redirect()->back()->with('success', '电子邮件更新成功');
}