laravel 在验证规则中使用多个 required_if
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Using multiple required_if in a validation rule
提问by Isaias
I have a selectwith many options, I want another selectto be required when the first has an specific value.
我有select很多选项，我希望select当第一个具有特定值时需要另一个。
<select id="category" name="category">
<option value="a">Option A</option>
<option value="b">Option B</option>
<option value="c">Option C</option>
<option value="d">Option D</option>
<option value="e">Option E</option>
<option value="f">Option F</option>
</select>
<select id="subcategory" name="subcategory">
<option value="a">Suboption A </option>
<option value="b">Suboption B </option>
<option value="c">Suboption C </option>
<option value="d">Suboption D </option>
<option value="e">Suboption E </option>
</select>
I want the second selectto be required when the user chooses option a,b or f. Is it correct to use the next rule in the controller code that validates the inputs?:
我希望select当用户选择选项 a、b 或 f 时需要第二个。在验证输入的控制器代码中使用下一条规则是否正确？：
$rules = array(
'category' => 'alpha|in:a,b,c,d,e,f|required|size:1',
'subcategory' => 'alpha|
in:a,b,f|
required_if:category,a|
required_if:category,b|
required_if:category,f|
size:1'
);
Is there (another or) a better way to validate this?
是否有（另一种或）更好的方法来验证这一点？
采纳答案by The Alpha
You may register a custom validation rule to check this, for example:
您可以注册自定义验证规则来检查这一点，例如：
Validator::extend('required_if_anyOfThese', function($attribute, $value, $parameters)
{
// Check here whether any of those Inputs are available and make sure
// what to do, return true or false depending on the result
$attribute is field name "subcategory"
$value will contain the value of the field
$parameters will contain the parameters, array => a,b,f
});
Use it as:
将其用作：
$rules = array('subcategory' => 'required_if_anyOfThese:a,b,f');
Read more on Laravel Website.
在Laravel 网站上阅读更多内容。
回答by MohitMamoria
Or, you can simply use it like so.
或者，您可以像这样简单地使用它。
$rules = array('subcategory' => 'required_if:category,a,b,f');
Laravel takes all the parameters except the first one as array and then checks if the value of first parameter is matched with the rest of parameters using in_arraymethod.
Laravel 将除第一个参数以外的所有参数作为数组，然后使用in_array方法检查第一个参数的值是否与其余参数匹配。
