/**
  * Handle the creation of a category.
  *
  * @return \Illuminate\Http\RedirectResponse
  */
 public function postIndex()
 {
     $form = $this->categories->getForm();
     if (!$form->isValid()) {
         return $this->redirectRoute('admin.categories.index')->withErrors($form->getErrors())->withInput();
     }
     $category = $this->categories->create($form->getInputData());
     return $this->redirectRoute('admin.categories.index');
 }