Sometimes a more fine-grained control over the validation is required. In such case you can hook into the validator.
Overwriting messages
It is possible to overwrite the error messages that will be returned when a validation rule fails:
class SongData extends Data
{
public function __construct(
public string $title,
public string $artist,
) {
}
public static function messages(): array
{
return [
'title.required' => 'A title is required',
'artist.required' => 'An artist is required',
];
}
}
Overwriting attributes
In the default Laravel validation rules, you can overwrite the name of the attribute as such:
class SongData extends Data
{
public function __construct(
public string $title,
public string $artist,
) {
}
public static function attributes(): array
{
return [
'title' => 'titel',
'artist' => 'artiest',
];
}
}
Overwriting other validation functionality
Next to overwriting the validator, attributes and messages it is also possible to overwrite the following functionality.
Redirect when validation fails
The redirect when a validation failed:
class SongData extends Data
{
// ...
public static function redirect(): string
{
return action(HomeController::class);
}
}
class SongData extends Data
{
// ...
public static function redirectRoute(): string
{
return 'home';
}
}
Stop on first failure
Whether to stop validating on the first failure:
class SongData extends Data
{
// ...
public static function stopOnFirstFailure(): bool
{
return true;
}
}
Error bag name
The name of the error bag:
class SongData extends Data
{
// ...
public static function errorBag(): string
{
return 'never_gonna_give_an_error_up';
}
}
Using dependencies in overwritten functionality
You can also provide dependencies to be injected in the overwritten validator functionality methods like messages, attributes, redirect, redirectRoute, stopOnFirstFailure, errorBag:
class SongData extends Data
{
public function __construct(
public string $title,
public string $artist,
) {
}
public static function attributes(
ValidationAttributesLanguageRepository $validationAttributesLanguageRepository
): array
{
return [
'title' => $validationAttributesLanguageRepository->get('title'),
'artist' => $validationAttributesLanguageRepository->get('artist'),
];
}
}
Overwriting the validator
Before validating the values, it is possible to plugin into the validator. This can be done as such:
use Illuminate\Validation\Validator;
class SongData extends Data
{
public function __construct(
public string $title,
public string $artist,
) {
}
public static function withValidator(Validator $validator): void
{
$validator->after(function ($validator) {
$validator->errors()->add('field', 'Something is wrong with this field!');
});
}
}
This method will only be called on the root data object that is being validated, all the nested data objects and collections withValidator methods will not be called.