internal void DeclineInvitation(int invitationId)
{
var currentInvitation =
Ensure.Any.IsNotNull(Invitations.Find(current => current.Id == invitationId));
if (currentInvitation.Status != InvitationStatus.InProgress)
{
throw new InvitationAlreadyChangedException(invitationId);
}
currentInvitation.Status = InvitationStatus.Declined;
}
internal Invitation GetInvitation(int invitationId)
{
return(Ensure.Any.IsNotNull(Invitations.Find(current => current.Id == invitationId)));
}