private void ValidateAppointmentInterval(DateTime initialDate, DateTime finalDate, int?id = null)
{
if (initialDate >= finalDate)
{
throw new DomainException("Appointment start must be before finish");
}
var appointments = _repository
.AppointmentsBetween(initialDate, finalDate);
if (id.HasValue)
{
appointments = appointments.Where(a => a.Id != id);
}
if (appointments.Count() > 0)
{
throw new DomainException("Exists another appointment at selected interval");
}
}