public override void Apply(ReadonlyGraph graph)
{
E dbItem = DbItem;
if (dbItem == null)
{
throw new InvalidOperationException($"edge {Item.GetType().Name} was not created");
}
Item.FromV = graph.FindById(DbItem.FromRid) as V ?? throw new NullReferenceException();
Item.ToV = graph.FindById(DbItem.ToRid) as V ?? throw new NullReferenceException();
Item.In = Item.ToV.Rid;
Item.Out = Item.FromV.Rid;
Item.FromV.OutE.Add(Item);
Item.ToV.InE.Add(Item);
Item.Rid = DbItem.Rid;
graph.GraphItems[Item.GetType()].Add(Item);
}