Question

Here are the relevant pieces. This is a parent object:

public class Article
{
    public virtual IList<ArticleRevision> Revisions { get; set; }
}

<list name="Revisions" cascade="all" inverse="true" table="ArticleRevision">
  <cache usage="read-write" />

  <key column="ArticleID" not-null="true" />
  <index column="Number" type="int32" />
  <one-to-many class="ArticleRevision" />
</list>

This is a child:

public class ArticleRevision
{
    public virtual Article Article { get; set; }
}

<many-to-one name="Article" column="ArticleID" not-null="true" />

Now, I create an instance of Article, add one ArticleRevision to Article.Revisions collection, set ArticleRevision.Article to reference the Article instance and shove it to the database:

INSERT 
INTO
    ArticleRevision
    (Content, Keywords, CreatedAt, SiteID, ArticleID, CreatedByUserID, ID) 
VALUES
    (@p0, @p1, @p2, @p3, @p4, @p5, @p6);

No Number column gets inserted.

How do I correctly map a bidirectional one-to-many collection with list semantics in NHibernate?

Answer 1

From the NHibernate documentation:

Please note that NHibernate does not
support bidirectional one-to-many
associations with an indexed
collection (list, map or array) as the
“many” end, you have to use a set or
bag mapping.