Laravel Custom Validation Rules should be lowercase? - laravel

Question

I have model, and it has several field names, and 'lastName' is among them.
In my FormRequest file, I have rules and messages for this field:
$rules = ['lastName.*' => 'lastName_fail: index'];
$messages = ['lastName.*lastName_fail' => This lastName has different value in DB!'];
When I am submitting a form, filling the 'lastName' field with intentionally 'wrong' value, it doesn't pass validation, and returns error message:
validation.last_name_fail
(which is not what's in $messages).
But when I change $rules and $messages to:
$rules = ['lastName.*' => 'lastname_fail: index'];
$messages = ['lastName.*lastname_fail' => This lastName has different value in DB!'];
(so the actual "rule" is now lowercase "lastname_fail"), it outputs what i want:
This lastName has different value in DB!
from this I may conclude that Laravel's validation rule name may be
only lowercase.
Is it declared anywhere in documentation?
If so, maybe it helps someone.

Answer 1

It is not mentioned in the documentation. However, there is a naming pattern for both validation rule method name and rule name.
Rule Method Name:
It must have validate prefix and the rest of it must be in Camel Case.
Rule Name:
It will be in lowercase without the validate prefix and each word will be separated by an underscore.
So if you want to add alpha_dash_spaces validation rule then the corresponding method will be named validateAlphaDashSpaces().

Answer 2

Simply parse $request[data] before Validator
use Illuminate\Support\Str;
$request['name_it'] = Str::lower($request['name_it']);
$request['name_en'] = Str::lower($request['name_en']);
$validator = Validator::make($request->all(), [
'name_it' => ['required', 'string', 'max:255', 'unique:categories'],
'name_en' => ['required', 'string', 'max:255', 'unique:categories'],
]);
if ($validator->fails()) {
return redirect()
->back()->withErrors($validator)
->withInput();
}