public static TChild GetOrThrow <TChild, TChildId>(this IHaveChildEntities <TChild, TChildId> parent, TChildId id, Func <Exception> exceptionFactory = null)
where TChild : Entity <TChildId>, new()
where TChildId : IId, IEquatable <TChildId>
{
return(parent.GetOrAdd(id, identity =>
{
throw exceptionFactory?.Invoke() ?? new EntityNotFoundException(id.ToString(), typeof(TChild));
}));
}
public static TChild GetOrCreate <TChild, TChildId>(this IHaveChildEntities <TChild, TChildId> parent, TChildId id)
where TChild : Entity <TChildId>, new()
where TChildId : IId, IEquatable <TChildId>
{
return(parent.GetOrAdd(id, identity =>
{
var newChild = new TChild();
var childAsHasParent = newChild as IHaveAParent;
childAsHasParent?.SetParent(parent as Entity);
return newChild;
}));
}