[5.3] Object based unique and exists rules for validation.

[taylorotwell]

Provides a more fluent and memorable interface for these rules when performing validation.

$validator = Validator::make(['name' => 'Taylor Otwell'], [
    'name' => [
        Rule::unique('users')->ignore(2)->where(function ($query) {
            $query->where('password', 'secret');
        }),

        Rule::exists('users', 'name')->where(function ($query) {
            $query->where('id', '>', 0);
        }),
    ],
]);