Laravel：验证器仅验证传递数据中存在的字段？
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Laravel: Validator to validate only fields which exist in the passed data?
提问by barakuda28
Currently the Validator will fail if I have a required rule for a key "name", but I haven't passed it in the data array. I want it not to fail in this case. I want to validate only the fields which exist in the data array. Is there a builtin way for that to happen, or I have to extend the Validator class?
目前，如果我有一个键“名称”的必需规则，验证器将失败，但我没有在数据数组中传递它。我希望它在这种情况下不会失败。我只想验证数据数组中存在的字段。是否有内置方法可以实现，或者我必须扩展 Validator 类？
回答by Holger Weis
You can use the sometimesvalidation rule.
您可以使用sometimes验证规则。
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.
在某些情况下，您可能希望仅当输入数组中存在该字段时才对该字段运行验证检查。要快速完成此操作，请将有时规则添加到您的规则列表中。
http://laravel.com/docs/validation#conditionally-adding-rules
http://laravel.com/docs/validation#conditionally-adding-rules
$v = Validator::make($data, array(
'email' => 'sometimes|required|email',
));
Be sure to run composer updatesince the sometimes shortcut is a Laravel 4.1.14 feature.
一定要运行，composer update因为有时快捷方式是 Laravel 4.1.14 的功能。
回答by Eduardo Aguad
You can use nullable and it will pass if email is not present
您可以使用 nullable，如果电子邮件不存在，它将通过
$request->validate([
'name' => 'required',
'email' => 'nullable|email'
])
Also, you should remove requiredvalidation.
此外，您应该删除required验证。
回答by Calvin
For Laravel version less then 5.9
对于低于 5.9 的 Laravel 版本
For anyone, having the validator object, using:
对于拥有验证器对象的任何人，使用：
Method ->validateFilled(string $attribute, mixed $value)
Method ->validateFilled(string $attribute, mixed $value)
may also help them to validate the given attribute is filled if it is present. May help someone in their respective case.
也可以帮助他们验证给定的属性是否存在。可能会在他们各自的情况下帮助某人。
Source:- https://laravel.com/api/5.8/Illuminate/Validation/Validator.html#method_validateFilled
来源：- https://laravel.com/api/5.8/Illuminate/Validation/Validator.html#method_validateFilled
