Validating a choice field against an array Symfony2

Question

I am building a form class in Symfony2. In my class, I have a choice field. I built a function to return my choice array:

public function getCardTypes()  {
    return array('visa' => 'Visa', 'mc' => 'MasterCard', 'amex' => 'American Express');
}

Later, I add a choice field to my form with this array:

$builder->add('PaymentCCType', 'choice', array('choices' => $this->getCardTypes()));

And then in getDefaultOptions function I have a choice constraint for this field:

'PaymentCCType' => new Choice(array('choices' => $this->getCardTypes())),

I seem to be having a problem with this validator. When I submit this form, I get the following error underneath my select box: "The value you selected is not a valid choice". Of course, I am using one of the choices in my array.

What am I doing wrong?

/* edit */

I have noticed that of the 4 fields I have like this, I only get the error on 3 of them. the one where the choice is month (simple 1-12), validation works.

/* edit 2 */

the issue appears to occur when the array key does not match the value. i switched my array to array('Visa' => 'Visa', 'MasterCard' => 'MasterCard', 'American Express' => 'American Express') and now it works. Is there any way around this? I feel like I can't be the only one with this issue. it occurs even when you have a regular (non-associative) array like array('Visa', 'MasterCard', 'American Express')

I don't think you have to add this in the getDefaultOptions method. Try your form with just the $builder->add(...) code. — AdrienBrault
@AdrienBrault I'm following this guide here: symfony.com/doc/current/book/forms.html#adding-validation — MrGlass

Codium Codium · Accepted Answer · 2012-07-08T13:14:12

IMHO you should do it in different way, create class with ChoiceListInterface with methods:

public function getChoices() 
{   
    return self::$choices;  
}

public static function getTypeChoicesKeys() 
{
    return array_keys(self::$choices);
}

in form class:

$builder->add('type', 'choice', 
        array(
            'expanded' => true, 
            'multiple' => false,
            'choice_list' => new TypeChoices(),
            'required' => true,
        )
      )

in validation.yml

    type:
        - NotNull: ~
        - Choice: { callback: [TypeChoices, getTypeChoicesKeys] }

Validating a choice field against an array Symfony2

2 Answers