Laravel有时vs有时|必填 [英] Laravel sometimes vs sometimes|required

问题描述

在Laravel验证中，有时|必需|电子邮件和有时|电子邮件之间有什么区别?我读过

What is the difference between sometimes|required|email and sometimes|email in Laravel validation?I've read this discussion from laracasts but still it is ambiguous for me

推荐答案

来自文档:

在某些情况下，您可能希望针对仅当输入数组中存在该字段时，才使用该字段.要快为此，请将有时会的规则添加到您的规则列表中

In some situations, you may wish to run validation checks against a field only if that field is present in the input array. To quickly accomplish this, add the sometimes rule to your rule list

https://laravel.com/docs/5.2/validation#conditionally-添加规则

如果我可以简化一下，我会说有时的意思是，仅当请求中显示该字段时，才应用其余的验证规则.想象有时就像一条if语句，该语句在应用任何规则之前检查请求/输入中是否存在该字段.

If I could simplify it, I would say sometimes means, only apply the rest of the validation rules if the field shows up in the request. Imagine sometimes is like an if statement that checks if the field is present in the request/input before applying any of the rules.

当页面上有一些JavaScript会禁用时，我会使用此规则，因为禁用某个字段时，它将不会显示在请求中.如果我只是说 required | email ，验证器将始终应用规则，而使用 stimes 规则仅在请求中显示该字段时才应用验证！希望有道理.

I use this rule when I have some javascript on a page that will disable a field, as when a field is disabled it won't show up in the request. If I simply said required|email the validator is always going to apply the rules whereas using the sometimes rule will only apply the validation if the field shows up in the request! Hope that makes sense.

示例:

input: []
rules: ['email' => 'sometimes|required|email']
result: pass, the request is empty so sometimes won't apply any of the rules

input: ['email' => '']
rules: ['email' => 'sometimes|required|email']
result: fail, the field is present so the required rule fails!

input: []
rules: ['email' => 'required|email']
result: fail, the request is empty and we require the email field!

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