Conditional validation of fields based on other field value in Symfony2

Question

So here is the scenario: I have a radio button group. Based on their value, I should or shouldn't validate other three fields (are they blank, do they contain numbers, etc).

Can I pass all these values to a constraint somehow, and compare them there?

Or a callback directly in the controller is a better way to solve this?

Generally, what is the best practice in this case?

Answer 1

I suggest you to use a callback validator.

For example, in your entity class:

<?php

use Symfony\Component\Validator\Constraints as Assert;

/**
 * @Assert\Callback(methods={"myValidation"})
 */
class Setting {
    public function myValidation(ExecutionContextInterface $context)
    {
        if (
                $this->getRadioSelection() == '1' // RADIO SELECT EXAMPLE
                &&
                ( // CHECK OTHER PARAMS
                 $this->getFiled1() == null
                )
            )
        {
            $context->addViolation('mandatory params');
        }
       // put some other validation rule here
    }
}

Otherwise you can build your own custom validator as described here.

Let me know you need more info.

Hope this helps.

Answer 2

You need to use validation groups. This allows you to validate an object against only some constraints on that class. More information can be found in the Symfony2 documentation http://symfony.com/doc/current/book/validation.html#validation-groups and also http://symfony.com/doc/current/book/forms.html#validation-groups

In the form, you can define a method called setDefaultOptions, that should look something like this:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    // some other code here ...
    $builder->add('SOME_FIELD', 'password', array(
        'constraints' => array(
            new NotBlank(array(
                'message' => 'Password is required',
                'groups' => array('SOME_OTHER_VALIDATION_GROUP'),
            )),
        )
   ))
}

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        'validation_groups' => function (FormInterface $form) {
            $groups = array('Default');
            $data = $form->getData();

            if ($data['SOME_OTHER_FIELD']) { // then we want password to be required
                $groups[] = 'SOME_OTHER_VALIDATION_GROUP';
            }

            return $groups;
        }
    ));
}

The following link provides a detailed example of how you can make use them http://web.archive.org/web/20161119202935/http://marcjuch.li:80/blog/2013/04/21/how-to-use-validation-groups-in-symfony/.

Hope this helps!