I am a bit confused about your question, but I'll answer the question I
think you asked
You seem to be confusing inverse with cascade. The two are separate, almost
entirely unrelated concepts. I will assume you are talking about a
bidirectional one-to-many relationship where the many side is a set.
You have
public class Invoice
{
protected virtual ISet<InvoiceItem> Items { get; set; }
public virtual bool AddItem(Invoiceitem newItem)
public virtual bool RemoveItem(InvoiceItem itemToRemove)
}
public class InvoiceItem
{
public virtual Invoice Invoice { get; protected set; }
}
When mapping invoice's items collection, use cascade="all" (or better yet,
"all,delete-orphan") and inverse="true".
Since the database only represents the one-to-many with the
[InvoiceItem].[InvoiceId] field, and the model represents each "side" of the
one-to-many with a reference, NHibernate will ignore one side.
inverse="true" means to look at invoiceItem.Invoice to fill
[InvoiceItem].[InvoiceId]. You should still keep both sides "in sync" in
your model. Don't be sloppy.
Cascade means when NHibernate flush (insert/update/delete) the invoice, it
will automatically include each child invoice item.
On Thu, Aug 12, 2010 at 11:07 AM, Niclas Pehrsson <[email protected]>wrote:
> My dream scenario in code is to be able to do the following code.
>
> var invoice = new Invoice();
> invoice.AddEntry(new InvoiceEntry("Title", unitPrice, quantity);
> session.Save(invoice);
>
> And then all the invoice entries will be saved with the invoice.
>
> As I have read and tried that isn't the most efficient way to do it
> because then I will be forced to use inverse="false" cause if it would
> be true the entries would not be associated with the invoice.
> And if I use inverse="false" I will get some unnecessary Update
> queries.
>
> Can NHibernate in any way do so I can do as my code example above and
> just take the Id (Guid) generated for the invoice and take with it in
> the insert queries for the entries?
>
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