Laravel 5更新验证电子邮件必须唯一

public function rules()
{
    return [
        'email' => 'required|email|unique:users,email,' . $this->id,
    ];
}

public function updateEmail(Request $request)
{
    $validator = Validator::make($request->all(), [
        'email' => 'required|email|unique:users,email,' . Auth::id(),
    ]);

    if ($validator->fails()) {
        return redirect()->back()->withErrors($validator)->withInput();
    }

    // 更新用户电子邮件的逻辑代码
}

<form method="POST" action="{{ route('updateEmail') }}">
    @csrf

    <div class="form-group">
        <label for="email">Email</label>
        <input type="email" name="email" id="email" value="{{ old('email', Auth::user()->email) }}" class="form-control">
        @error('email')
            <span class="text-danger">{{ $message }}</span>
        @enderror
    </div>

    <button type="submit" class="btn btn-primary">Update Email</button>
</form>