gistfile1.txt

  <?php
  /**
   * Process the form.
   *
   * @param \Symfony\Component\HttpFoundation\Request $request
   * @param \Symfony\Component\Form\FormInterface $form
   * @param boolean $removeExtraFields
   */
  private function processForm(Request $request, FormInterface $form, $removeExtraFields = FALSE)
  {
    $data = json_decode($request->getContent(), true);

    // If you send extra fields to a form it will give you an error. This will
    // remove the extra fields.
    if ($removeExtraFields) {
      $formFields = $form->all();
      $data = array_intersect_key($data, $formFields);
    }

    $clearMissing = $request->getMethod() != 'PATCH';
    $form->submit($data, $clearMissing);
  }