/**
  * Request method to delete category
  *
  * @param id of category to delete
  * @return view
  */
 @RequestMapping(value = "/delete/category", method = RequestMethod.GET)
 public ModelAndView deleteCategory(@RequestParam int id) {
   categoryService.deleteCategory(id);
   ModelAndView view = new ModelAndView("redirect:/admin/categories");
   view.addObject("categories", categoryService.getAllCategories());
   return view;
 }