Laravel Custom Validation Order - laravel

Question

I add a custom Validation Rule
Validator::extend('validate_timezone', function($attribute, $value, $parameters, $validator) {
$items = request('items');
$from_date = Carbon::createFromFormat('Y-m-d H:i:s', $item['from_date']);
// my code below depend on $from_date
......
......
return true;
);
validation rule
"from_date" => "required|date_format:Y-m-d H:i:s|validate_timezone",
The problem, custom validation validate_timezone run before 'date_format:Y-m-d H:i:s', so if the format of date is wrong, I will get error inside validate_timezone function
How can I force to validate date_format:Y-m-d H:i:s before the custom validation validate_timezone?

Answer 1

In the documentation the following can be found:
Rules will be validated in the order they are assigned.
Meaning the code is working as expected.
You're probably looking for the bail option:
Sometimes you may wish to stop running validation rules on an attribute after the first validation failure. To do so, assign the bail rule to the attribute
Which would mean you should try this:
"from_date" => "bail|required|date_format:Y-m-d H:i:s|validate_timezone",

Answer 2

The custom extended validation rule is running first because it's probably defined in the boot function of a service provider which runs on every request, so you need to catch the Carbon exception and return false accordingly
public function boot()
{
\Validator::extend('validate_timezone', function ($attribute, $value, $parameters, $validator) {
try {
$from_date = Carbon::createFromFormat('Y-m-d H:i:s', $value);
return true;
} catch (Exception $ex) {
logger()->warning($ex->getMessage());
return false;
}
});
}
Now if carbon can't create from the format passed, it will thrown an exception that we catch, log and return false
And as #PtrTon mentioned, you need to bail on first validation fail
Now assuming a validation logic like this
Route::post('/', function () {
$validate = request()->validate([
"from_date" => "bail|required|date_format:Y-m-d H:i:s|validate_timezone",
]);
dd($validate);
});
And a view form like this
<form action="/" method="post">
#csrf
<input type="datetime" name="from_date" value="2019-10-16 15:03">
<button type="submit">Submit</button>
</form>
#if ($errors->any())
<div class="alert alert-danger">
<ul>
#foreach ($errors->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
#endif
The value of the date_from is not valid for both date_format and validate_timezone but only the validation error message of date_format will be returned
Hope this helps