lumen laravel:如何返回第一个错误的消息？

use Illuminate\Support\Facades\Validator;

public function store(Request $request)
{
    $validator = Validator::make($request->all(), [
        'name' => 'required',
        'email' => 'required|email',
        'password' => 'required|min:6',
    ]);

    if ($validator->fails()) {
        $errors = $validator->errors();
        $firstError = $errors->first();
        return response()->json(['error' => $firstError], 400);
    }

    // 验证通过，继续处理逻辑
    // ...
}