public function process(FormRuleProcessorContext $context, FormRuleContextBuilder $collection)
 {
     $form = $context->getForm();
     $formConfig = $form->getConfig();
     if (!$formConfig->getCompound()) {
         return;
     }
     $transformer = $this->findTransformer($formConfig, 'Symfony\\Component\\Form\\Extension\\Core\\DataTransformer\\ValueToDuplicatesTransformer');
     if ($transformer === null) {
         return;
     }
     $keys = $this->getKeys($transformer);
     if (empty($keys)) {
         return;
     }
     $formView = $context->getView();
     // Use children here since we need the full_name
     $primary = array_shift($keys);
     $primaryView = $formView->children[$primary];
     // Copy all rules to the first child/key element
     $ruleCollection = $collection->get($formView);
     if (!empty($ruleCollection)) {
         $collection->add($primaryView, $ruleCollection);
     }
     $collection->remove($formView);
     // Get correct error message if one is set.
     $invalidMessage = $this->getFormRuleMessage($formConfig);
     // Create equalTo rules for all other fields
     $equalToPrimaryRule = new TransformerRule('equalTo', FormHelper::generateCssSelector($primaryView), $invalidMessage, array(new FieldDependency($primaryView)));
     foreach ($keys as $childName) {
         $childCollection = new RuleCollection();
         $childCollection->set('equalTo', $equalToPrimaryRule);
         $collection->add($formView->children[$childName], $childCollection);
     }
 }