Laravel 4.2 validation: required_unless

Question

Recently I have been learning Laravel and came accross validator problem that would be solved by using validator rule required_unless from Laravel 5.2:

$validator = Validator::make(
    array(
        'social_id' => $social_id,
        'login_by' => $login_by
    ), array(
        'social_id' => 'required_unless:login_by,manual',
        'login_by' => "in:manual,google,facebook, stack_exchange, myspace"
    )
);

Problem is that I use Laravel 4.2 and this validation rule is not implemented jet.

Is there any other validating rule I could use or any other way?

If not, how would I write a custom validation rule and where would I put it?

Edit: I could do:

$validator = Validator::make(
    array(
        'social_id' => $social_id,
        'login_by' => $login_by
    ), array(
        'social_id' => 'required_if:login_by,google,facebook, stack_exchange, myspace',
        'login_by' => "in:manual,google,facebook, stack_exchange, myspace"
    )
);

...but this is just a workaround not an elegant permanent solution.

Answer 1

You can simply extend the Validator with the extend method.

Something like this

Validator::extend('required_unless', function ($attribute, $value, $parameters) {
    // Implement your version of required_unless here
});

And even steal a bit of logic from L5.2 here

You can see the doc on extend here