Validate form fields without submitting data

validateFormFields.php

    private function validateForm(Form $form, $entity, $groups = array('submission'))
    {
        $errors = $this->get('validator')->validate($entity, $groups, true, true);
        foreach ($errors as $error) {
            $propertyPath = $error->getPropertyPath();
            if (strpos($propertyPath, '[') !== false || strpos($propertyPath, '.') !== false) {
                /**
                 * Very dirty form field parser
                 *
                 * teamMember[0].role is converted to teamMember.0.role
                 *
                 * Then this string is exploded to get an array ['teamMember', 0, 'role']
                 *
                 * Then we recursively iterate over the fields in the form, to get to the field where the error should
                 * be added.
                 *
                 * So for teamMember[0].role it will return :
                 * $formField = $form->get('teamMember)->get('0')->getRole();
                 *
                 * Which would be the role property of the first team member defined ...
                 */
                $propertyPath = str_replace('[', '.', $propertyPath);
                $propertyPath = str_replace(']', '', $propertyPath);
                $propertyPath = explode('.', $propertyPath);
                // Get first field
                $fieldName = array_shift($propertyPath);
                $formField = $form->get($fieldName);
                // Loop over rest ...
                foreach ($propertyPath as $field) {
                    $formField = $formField->get($field);
                }
                $formField->addError(new FormError($error->getMessage()));
            } else {
                $form->get($propertyPath)->addError(new FormError($error->getMessage()));
            }
        }
    }