Phalcon PHP验证唯一性，但允许为空值

Question

I have the following validation:

use Phalcon\Validation;
use Phalcon\Validation\Validator\Uniqueness;

class Users extends BaseModel {
    public function validation() {
        $validator = new Validation();
        $validator->add('some_data', new Uniqueness([
                    'message' => 'this field must be unique or epmty'
        ]));
        // some other rules (...)
        return $this->validate($validator);
    }
}

The question is how to allow pass empty data. I'd like to save in database NULL if data is empty or unique value if it's passed.

Answer 1

you can also do this

public function validation()
{
    $validator = new Validation();

    if (!empty($this->getSomeData())) {
        $validator->add('some_data', new Uniqueness([
            'message' => 'this field must be unique or epmty'
        ]));
    }
    // some other rules (...)
    return $this->validate($validator);
}

Answer 2

Ok, I found solution with CallbackValidator

    $validator->add('some_data', new CallbackValidator([
                    "callback" => function($data) {
                        if (!empty($data->getSomeData())) {
                            return new Uniqueness([
                                "message" => "this field must be unique or epmty"
                            ]);
                        }
                    }
        ]));