Expression Language Symfony Component - cannot validate empty string

Question

I tried to play around Expression Language in validation, and I found something strange.

Let's consider Dog model

class Dog
{

    /**
     * @Assert\Expression("this.getName() != 'aa' ", message="Not good!")
     */
    private $name = 'aa';
    ...
}

'aa' != 'aa' => false so validation service reports error - cool, but lets try to do the same with

class Dog
{

    /**
     * @Assert\Expression("this.getName() != '' ", message="Not good!")
     */
    private $name = '';
    ...
}

This one does not return any error during validation??? Why?

abdulklarapl · Accepted Answer · 2014-04-04 13:14:23Z

2

Oh, I've found line that you can be interested by :)

line 47, vendor/symfony/symfony/src/Symfony/Component/Validator/Constraints/ExpressionValidator.php

if (null === $value || '' === $value) {
  return;
}

answered Apr 4, 2014 at 13:14

abdulklarapl

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