code: @RequestMapping(value = "groups", method = RequestMethod.GET)
      public Resources<AccountGroup> getAccountGroups() {
          return Resources.of(
                  accountService.getAccountGroups(),
                  uri(on(getClass()).getAccountGroups())
          )
                  .with(Link.CREATE, uri(on(AccountController.class).getGroupCreationForm()));
      }
docs: List of groups