internal static IEnumerable <MemoryItem> GetMemory(string groupKey, string memberKey) => Memories.Where(m => m.MemberKey == memberKey);
internal static IEnumerable <PresentItem> GetMemoryPresentation(string groupKey, string memberKey, string parentid)
{
return(Memories.Where(i => i.GroupKey == groupKey && i.MemberKey == memberKey && i.ParentId == parentid && ActiveChild(new[] { i })).Select(i => MemoryToPresentation(groupKey, memberKey, i)));
}