Save parent with children in one query ( children have null value reference for parent)

Question

Good day. I can't save parent with children in same query. But children have null reference for parent... Parent in my DB is table "food_in_the_cart" and model for it is here:

    public class FoodInTheCartModel
    {
        public virtual int ID { get; set; }
        public virtual ClientModel Client { get; set; }
        public virtual EstablishmentModel Stocked { get; set; }
        public virtual ProductModel DesirableProduct { get; set; }
        public virtual IList<CartAdditiveModel> Additives { get; set; } //children
        public virtual void AddAdditivesToTheCart(CartAdditiveModel a)
        {
            a.Cart = this;
            Additives.Add(a);
        }
        public FoodInTheCartModel()
        {
            this.Additives = new List<CartAdditiveModel>();
        }
    }

Mapping also:

public FoodInTheCartMap()
{
    Table("food_in_the_cart");

    Id(x => x.ID)
        .Column("id")
        .GeneratedBy.Native("food_in_the_cart_id_seq");

    References(x => x.Client)
        .Column("fk_id_client")
        .Not.Nullable()
        .Not.LazyLoad();

    References(x => x.DesirableProduct)
        .Column("fk_id_product")
        .Not.Nullable()
        .Not.LazyLoad();

    References(x => x.Stocked)
        .Column("fk_id_stock")


 .Not.Nullable()
            .Not.LazyLoad();

        HasMany(x => x.Additives)
            .Table("cart_additive")
            .Cascade.SaveUpdate()
            .Cascade.All()
            .Inverse()              
            .Not.LazyLoad();
    }

And child is cart_additive. Model of cart_additive is type of CartAdditive and has reference for model of food_in_the_cart, also mapping this reference is:

        References(x => x.Cart)
            .Column("fk_id_cart")                                      
            .Not.LazyLoad();

Type relationship between these two tables is one to many: food_in_the_cart has many cart_additive. Seems I tried everything for saving query for parent with children... But children still have null value for parent. How to make parent reference in child not null?

Answer 1

I removed Insert() from has many in FoodInTheCartMap and and added AsBug() there, also allowed null values for fk of food_in_the_cart in cart_additives as for reference called Cart in model for this table. All works this way. Yay.