public static void expenseParticipants(Long id, String query) {
    Expense expense = Expense.findById(id);
    List<User> users = null;
    if (query != null && !query.isEmpty()) {
      users = User.findByNickNameExcludeExpense(query, expense, new Pagination(1, 10));
    }

    render(expense, users, query);
  }
  public static void expense(Long id) {
    Expense expense = Expense.findById(id);
    List<Bill> bills = Bill.generateByExpense(expense);

    render(expense, bills);
  }