autofixture - AutoFixture を使用して、親のプロパティに基づいて子オブジェクトのプロパティを割り当てるにはどうすればよいですか?

Question

コレクションを持つOrderオブジェクトがありますShipments。Shipmentという性質がありますOrderId。AutoFixture をカスタマイズして、order.Shipments.All(s => s.OrderId == order.Id)真の順序を生成するにはどうすればよいですか?

私はすでに次のテクニックを試しましたが、成功しませんでした:

fixture.Customize<Order>(c => c.Do(o => {
    // This is called before the Order's properties have been populated,
    // so there are no shipments yet.
    foreach (var s in o.Shipments) {
        s.OrderId = o.Id;
    }
}));

---

fixture.Customize<Order>(c => c.Do(o => {
    o.Id = c.Create<Guid>();       // System.InvalidCastException
    o.Shipments = new List<Shipment>(c.CreateMany<Shipment>());
    foreach (var shipment in o.Shipments) {
        shipment.OrderId = o.Id;
    }
}));

---

class OrderGenerator : ISpecimenBuilder {
    public object Create(object request, ISpecimenContext context) {
        if (request as Type == typeof(Order)) {
            // ObjectCreationException due to circular reference
            var order = (Order)context.Resolve(request);
            foreach (var shipment in order.Shipments) {
                shipment.OrderId = order.Id;
            }
        }
    }
}
fixture.Customizations.Add(new OrderGenerator());

これを行う最善の方法は何ですか？