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POSymfony2 form validator groups without entities
 

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    <p>I'm using Symfony2 form component to build and validate forms. Now I need to setup validator groups based on a single field value, and unfortunately it seems that every example out there is based on entities - which im not using for several reasons.</p> <p>Example: If task is empty, all constraint validators should be removed, but if not, it should use the default set of validators (or a validator group). </p> <p>In other words, what I'm trying to achieve is making subforms optional, but still be validated if a key field is populated.</p> <p>Can someone possible give me an example how to configure it?</p> <pre><code>&lt;?php namespace CoreBundle\Form\Type; use Symfony\Component\Form\AbstractType; use Symfony\Component\Form\FormInterface; use Symfony\Component\Form\FormBuilderInterface; use Symfony\Component\OptionsResolver\OptionsResolverInterface; use Symfony\Component\Validator\Constraints as Assert; use CoreBundle\Form\Type\ItemGroupOption; class ItemGroup extends AbstractType { public function buildForm(FormBuilderInterface $builder, array $options) { $builder-&gt;add('title', 'text', array( 'label' =&gt; 'Titel', 'attr' =&gt; array('class' =&gt; 'span10 option_rename'), 'required' =&gt; false )); $builder-&gt;add('max_selections', 'integer', array( 'label' =&gt; 'Max tilvalg', 'constraints' =&gt; array(new Assert\Type('int', array('groups' =&gt; array('TitleProvided')))), 'attr' =&gt; array('data-default' =&gt; 0) )); $builder-&gt;add('allow_multiple', 'choice', array( 'label' =&gt; 'Tillad flere valg', 'constraints' =&gt; array(new Assert\Choice(array(0,1))), 'choices' =&gt; array(0 =&gt; 'Nej', 1 =&gt; 'Ja') )); $builder-&gt;add('enable_price', 'choice', array( 'label' =&gt; 'Benyt pris', 'constraints' =&gt; array(new Assert\Choice(array(0,1))), 'choices' =&gt; array(0 =&gt; 'Nej', 1 =&gt; 'Ja'), 'attr' =&gt; array('class' =&gt; 'option_price') )); $builder-&gt;add('required', 'choice', array( 'label' =&gt; 'Valg påkrævet', 'constraints' =&gt; array(new Assert\Choice(array(0,1))), 'choices' =&gt; array(0 =&gt; 'Nej', 1 =&gt; 'Ja') )); $builder-&gt;add('options', 'collection', array( 'type' =&gt; new ItemGroupOption(), 'allow_add' =&gt; true, 'allow_delete' =&gt; true, 'by_reference' =&gt; false ) ); $builder-&gt;add('sort', 'hidden'); } public function getName() { return 'item_group'; } public function setDefaultOptions(OptionsResolverInterface $resolver) { global $app; $resolver-&gt;setDefaults(array( 'validation_groups' =&gt; function(FormInterface $form) use ($app) { // Get submitted data $data = $form-&gt;getData(); if (count($app['validator']-&gt;validateValue($data['title'], new Assert\NotBlank())) == 0) { return array('TitleProvided'); } else { return false; } }, )); } } </code></pre>
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