Laravel验证:仅必填，且仅一个字段 [英] Laravel validation: Required only and only one field

问题描述

我有两个字段，分别是数字和百分比.我希望用户仅在一个输入字段中输入值.如果用户在数字和百分比字段中输入值，则系统应引发验证错误.我们可以通过laravel验证来做到这一点吗?

I have got two fields namely number and percentage. I want a user to input value in only one input field. If a user inputs values in both number and percentage field, the system should throw validation error. Is there anything we can do with laravel validation to achieve this?

谢谢.

推荐答案

您可以为此编写一个自定义验证器: http://laravel.com/docs/5.0/validation#custom-validation-rules

You can write a custom validator for that: http://laravel.com/docs/5.0/validation#custom-validation-rules

可能看起来像这样:

class CustomValidator extends Illuminate\Validation\Validator {

    public function validateEmpty($attribute, $value)
    {
        return ! $this->validateRequired($attribute, $value);
    }

    public function validateEmptyIf($attribute, $value, $parameters)
    {
        $key = $parameters[0];

        if ($this->validateRequired($key, $this->getValue($key))) {
            return $this->validateEmpty($attribute, $value);
        }

        return true;
    }
}

在服务提供商中注册:

Validator::resolver(function($translator, $data, $rules, $messages, $attributes)
{
    return new CustomValidator($translator, $data, $rules, $messages, $attributes);
});

使用它(例如，在表单请求中):

Use it (in a form request, for example):

class StoreSomethingRequest extends FormRequest {
    // ...

    public function rules()
    {
        return [
            'percentage' => 'empty_if:number',
            'number'     => 'empty_if:percentage',
        ];
    }
}

更新 刚刚在修补匠中对其进行了测试:

Update Just tested it in Tinker:

Validator::make(['foo' => 'foo', 'bar' => 'bar'], ['bar' => 'empty_if:foo'])->fails()
=> true
Validator::make(['foo' => '', 'bar' => 'bar'], ['bar' => 'empty_if:foo'])->fails()
=> false
Validator::make(['foo' => '', 'bar' => 'bar'], ['foo' => 'empty_if:bar'])->fails()
=> false

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