public List <PayerVM> GetUsersByExpense(int id)
{
var myExpense = mysticoContext.GetExpenseById(id);
var myEvent = mysticoContext.GetEventByExpense(myExpense);
var myParticipants = mysticoContext.GetUsersByEventId(myEvent.Id);
var myPayers = mysticoContext.GetPayersByExpense(myExpense);
var participantsWithMarkedPayers = Library.ConvertToListOfPayersVM(myParticipants, myPayers);
return(participantsWithMarkedPayers);
}