Zend\Form\Form not displayin error message from custom validator

Question

I'v creatated a custom validator:

class MyValidator extends AbstractValidator
{
    const ERROR_CONST = 'error';

    protected $dbAdapter;
    protected $messageTemplates = array(
        self::ERROR_CONST => "Error msg for '%value%'."
    );

    public function __construct($dbAdapter)
    {
        $this->dbAdapter = $dbAdapter;
    }

    public function isValid($value, $context = null)
    {
        $this->setValue($value);
        /**
         * Do validation against db
         */

        if(/* Not valid */){
            $this->error(self::ERROR_CONST);
            return false;
        }
        return true;
    }
}

The validation work, I've been able to test it. What doesn't work is the output of the error message using

echo $this->formElementErrors($form->get('action'));

All that is outputted is an empty UL. Is this a translator issue? When I do a get_class on $this->getTranslator() in the validator I get the validator class name. When I var_dump $this->getTranslator() it outputs null. Do I need to set a translator for this to work and where would be the best place to set that translator so that it's system wide for my own validators?

Answer 1

Because you define a __construct method for your validator class, the parent __construct is not implicitly called: http://php.net/manual/en/language.oop5.decon.php (see the note)

You should modify your __construct method:

public function __construct($dbAdapter)
{
    $this->dbAdapter = $dbAdapter;
    //parent::__construct($options);
    parent::__construct(null); // or (void)
}

As you can see, $messageTemplates and $messageVariables are "loaded" from AbstractValidator::__construct, for being used in some methods ( error included):

https://github.com/zendframework/zf2/blob/master/library/Zend/Validator/AbstractValidator.php#L73-L79

Answer 2

Maybe you forgot to add messageVariables ?

/**
 * Message variables
 * @var array
 */
protected $messageVariables = array(
    'value'  => 'value',
);