php 如果字段为空，则 Laravel 验证规则需要另一个字段
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Laravel validation rules if field empty another field required
提问by Marco
I have a Laravel 5.3 app, and an update form where I send user profile values. One of them is user image as well, I am creating a hidden input field for it, so if the user is not uploading any new image, I can still see that he has the hidden field with the old image value.
我有一个 Laravel 5.3 应用程序和一个用于发送用户配置文件值的更新表单。其中之一也是用户图像，我正在为它创建一个隐藏的输入字段，所以如果用户没有上传任何新图像，我仍然可以看到他有带有旧图像值的隐藏字段。
<input type="hidden" class="form-control" name="old_image" value="{{ $player->image_filename }}" id="oldImage">
If he removes the image, the hidden input value becomes empty.
如果他移除图像，隐藏的输入值变为空。
document.getElementById('oldImage').value = '';
That is how I thought of updating a user image. But I don't know how to set up validation rules for that form. Something that would be similar to this:
这就是我想到更新用户图像的方式。但我不知道如何为该表单设置验证规则。与此类似的内容：
public function rules()
{
return [
'first_name' => 'required|max:50',
'last_name' => 'required|max:50',
'birthday' => 'required',
'image' => required if old_image empty
];
}
I have tried with 'image' => 'required_without:old_image',and also with 'image' => 'required_if:old_image, null',but none of them showed any error message for missing image. I am showing error messages like this:
我已经尝试过'image' => 'required_without:old_image',，也尝试过，'image' => 'required_if:old_image, null',但没有一个显示任何丢失图像的错误消息。我正在显示这样的错误消息：
回答by Richelly Italo
You can work with two rules
您可以使用两个规则
'image' => 'required_if:old_image'
Or:
或者：
'image' => 'required_without:old_image'
回答by Mohannad Najjar
this is can be done by required_withoutrule, if it's not working please show an actual sample request data ( dd(request()->all() )) and the validation rules you are using. the scenario you want to catch is simple: if both fields is empty.
这可以通过required_without规则来完成，如果它不起作用，请显示实际示例请求数据 ( dd(request()->all() )) 和您正在使用的验证规则。您想要捕捉的场景很简单：如果两个字段都为空。
in your example, applying this rule should work:
在您的示例中，应用此规则应该有效：
return [
// ...
'image' => 'required_without:old_image'
];
required_without:foo,bar,...
The field under validation must be present and not empty only when any of the other specified fields are not present. Validation - Laravel 5.3
required_without:foo,bar,...
仅当任何其他指定字段不存在时，验证中的字段必须存在且不能为空。 验证 - Laravel 5.3
Example:
例子：
$rules = [
'new_value' => 'required_without:old_value'
];
validator(
['new_value' =>'',
'old_value' => 'old value is preserved here']
, $rules)->errors()->toArray();
// output: [] <-- no errors!
validator(
['new_value' =>'New value!',
'old_value' => '']
, $rules)->errors()->toArray();
// output: [] <-- no errors!
validator(
['new_value' =>'',
'old_value' => '']
, $rules)->errors()->toArray();
// output: ["new_value" => ["The new value field is required when old value is not present."]]
回答by Ramzan Mahmood
Try this
尝试这个
if (empty($request->input('old_image'))){
$this->validate($request, [
'image' => 'required',
]);
}
else {
// Validation in case of else goes here
$this->validate($request, [
// rule
]);
}
