Laravel扩展验证自定义消息

Question

我想创建这个扩展验证.

Validator::extend('my_custom_validation_rule', function ($attribute, $value, $parameters) {
   // I guess I should be setting the error message for this here.(Its dynamic)
   // We can return true or false here depending upon our need.  
}

我会像这样使用这个规则

'my_field' => 'required|my_custom_validation_rule',

我想使用一些动态消息来解决" my_custom_validation_rule" 的错误

我无法从文档中找到有关它的内容.无论如何要做到这一点？

Answer 1

该extend方法允许将消息作为第三个参数传递:

Validator::extend('my_custom_validation_rule', function ($attribute, $value, $parameters) {
    // ...
}, 'my custom validation rule message');

默认情况下,您只能使用动态变量:attribute.如果您想添加更多用途Validator::replacer():

Validator::replacer('my_custom_validation_rule', function($message, $attribute, $rule, $parameters){
    return str_replace(':foo', $parameters[0], $message);
});

Answer 2

这与@lukasgeiter的答案基本相同，但是如果您需要在扩展函数内管理动态变量，您可以$validator->addReplacer直接在扩展内使用。

Validator::extend('my_custom_validation_rule', function ($attribute, $value, $parameters, $validator) {

    // Test custom message
    $customMessage = request()->get('foo') 
        ? "Foo doesn't exist"
        : "Foo exist";

    // Replace dynamic variable :custom_message with $customMessage
    $validator->addReplacer('my_custom_validation_rule', 
        function($message, $attribute, $rule, $parameters) use ($customMessage) {
            return \str_replace(':custom_message', $customMessage, $message);
        }
    );

    // Test error message. (Make it always fail the validator)
    return false;

}, 'My custom validation rule message. :custom_message');

Answer 3

您还可以在验证翻译文件下为您的自定义验证规则定义消息。

/resources/lang/en/validation.php

....
'unique'                    => 'The :attribute has already been taken.',
'uploaded'                  => 'The :attribute failed to upload.',
'url'                       => 'The :attribute format is invalid.',
//place your translation here
'my_custom_validation_rule' => 'The :attribute value fails custom validation.'