流利的 NHibernate 没有在 HasMany 中保存外键。 该列仍然是 null

Question

I am struggling to have the Foreign Keys in my mappings.

My Model looks like this:

 public class Accountant: Entity
    {
        public virtual string Name { get; set; }
        public virtual IList<Company> Companies { get; set; }

    }

    public class Company: Entity
    {
        public virtual string Name { get; set; }
        public virtual Subscriber Subscriber { get; set; }
        public virtual Accountant Accountant { get; set; }
        public virtual Funder Funder { get; set; }  
    }

and my Mappings look like this

     public class AccountantMap : ClassMap<Accountant>
    {
        public AccountantMap()
        {
            Id(x => x.Id);
            Map(x => x.Name);

            HasMany(x => x.Companies)
               .Inverse()
              .Cascade.All();

            Table("tblAccountant");
        }
    }
 public class CompanyMap : ClassMap<Company>
    {
        public CompanyMap()
        {
            Id(x => x.Id);
            Map(x => x.Name);

            References(x => x.Subscriber).Cascade.SaveUpdate();
            References(x => x.Accountant).Cascade.SaveUpdate();
            References(x => x.Funder).Cascade.SaveUpdate();

            Table("tblCompany");
        }
    }

And so, what I am trying to do, am trying to save the Accountant Object and it must update the foreign key in the table tblCompany

here's how my Save method looks like

    public void Create_Accountant()
        {

            var repo = new Repository();

            var companies = new List<Company>();

            companies.Add(repo.GetById<Company>(new Guid("02032BD9-2769-4183-9750-AF1F00A5E191")));
            companies.Add(repo.GetById<Company>(new Guid("F86E8B40-73D2-447E-A525-AF1F00A5E191")));

            var accountant = new Accountant
            {
                Name = "Accountant Simba",
Companies= companies
            };

            repo.Save(accountant);

        }

   public void Save<T>(T entity) where T: Entity
        {
            using (var session = _factory.OpenSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    try
                    {
                        session.SaveOrUpdate(entity);
                        session.Flush();
                        transaction.Commit();
                        //return entity.Id;

                    }
                    catch (Exception)
                    {
                        transaction.Rollback();
                        throw;
                    }
                }
            }
        }

After the code has executed, this is what in my Database

DB Results

You'd notice that the Account_id column is empty and it should not be empty.

Someone, please help me, what am I doing wrong?

Answer 1

The references are not set but Inverse() tells NHibernate to use the references. Change the code to this then you can't forget to set it anymore.

public class Accountant : Entity
{
    public Accountant()
    {
        Companies = new ParentAwareCollection<Company>(c => c.Accountant = this, c => c.Accountant = null);
    }
    public virtual string Name { get; set; }
    public virtual IList<Company> Companies { get; protected set; }
}

public sealed class ParentAwareCollection<TChild> : Collection<TChild>
{
    private readonly Action<TChild> _setParent;
    private readonly Action<TChild> _removeParent;

    public ParentAwareCollection(Action<TChild> setParent, Action<TChild> removeParent)
    {
        _setParent = setParent;
        _removeParent = removeParent;
    }

    protected override void InsertItem(int index, TChild item)
    {
        base.InsertItem(index, item);
        _setParent(item);
    }
    protected override void RemoveItem(int index)
    {
        TChild removedItem = this[index];
        _removeParent(removedItem);
        base.RemoveItem(index);
    }

    protected override void ClearItems()
    {
        foreach (var item in this)
        {
            _removeParent(item);
        }
        base.ClearItems();
    }
}

and usage

    var accountant = new Accountant
    {
        Name = "Accountant Simba",
        Companies = 
        {
            repo.GetById<Company>(new Guid("02032BD9-2769-4183-9750-AF1F00A5E191")),
            repo.GetById<Company>(new Guid("F86E8B40-73D2-447E-A525-AF1F00A5E191"))
        }
    };