Laravel Custom Extended Validation Post
I wanted to create this extended validation.
Validator::extend('my_custom_validation_rule', function ($attribute, $value, $parameters) {
// I guess I should be setting the error message for this here.(Its dynamic)
// We can return true or false here depending upon our need.
}
I would use this rule like this
'my_field' => 'required|my_custom_validation_rule'
,
I want to use a dynamic message for the error " my_custom_validation_rule
"
I was unable to find anything from the documentation about this. Is there anyway to do it?
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The method extend
allows you to pass a message as the third argument:
Validator::extend('my_custom_validation_rule', function ($attribute, $value, $parameters) {
// ...
}, 'my custom validation rule message');
By default, you can only use a dynamic variable :attribute
. If you want to add more usage Validator::replacer()
:
Validator::replacer('my_custom_validation_rule', function($message, $attribute, $rule, $parameters){
return str_replace(':foo', $parameters[0], $message);
});
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You can also define a message for your custom validation rule in the validation files file.
/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.'
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Basically, this is similar to @ lukasgeiter's answer, but in case you need to manage a dynamic variable inside an extension function, you can use it $validator->addReplacer
inside an extension directly.
Validator::extend('my_custom_validation_rule', function ($attribute, $value, $parameters, $validator) {
// Test custom message
$customMessage = request()->get('foo')
? "Foo does not 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');
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