Paul,
When you get a Master entity into your persistent context, because "members"
is LAZY field it should not be loaded.
Persisting a Member entity should not affect this LAZY field unless you
access the list by calling getMembers().
You must set the "master" field in newly created Member instance (since
optional = false), then persist it. The row inserted into MEMBER table will
have the foreign key value set to the primary key of the MASTER it belongs
to. This persist action should not load its master's "members" list.
Catalina
On Sat, Mar 28, 2009 at 12:06 PM, Paul Copeland <t...@jotobjects.com> wrote:
> Here is a naive question about a OneToMany relationship. This is probably
> a basic question.
>
> I have a lazily fetched List. It might be large and I don't want to load
> it until it is accessed.
>
> In a transaction - If I create and persist a new Entity that is a member of
> the list, I think (is this right?) the new uncommited persistent Entity will
> be loaded into that List when the list is first accessed. So I do not need
> to explicitly call List.add(newEntity) which would force the List to be
> loaded.
>
> But if do access the List for some reason and then create and persist a
> second Entity the List will be out of date unless I explicitly add the new
> Entity to the list.
>
> Hope that makes sense - Perhaps what I am looking for is a way to detect if
> the List has already been fetched before I explicitly call
> List.add(newEntity).
>
> Here are my related Entities (not sure if this is correct or not). The
> scenario is that I am creating new Members that are members of the List in
> Master.
>
> @Entity
> public class Master implements java.io.Serializable
> {
> . . .
>
> @OrderBy
> @OneToMany(mappedBy="master", fetch=FetchType.LAZY,
> cascade={CascadeType.PERSIST,CascadeType.REMOVE})
> private List<Member> members;
>
> public List<Member> getMembers() { return members; }
> }
>
>
> @Entity
> public class Member implements java.io.Serializable
> {
> @ManyToOne (optional=false, fetch=FetchType.LAZY,
> cascade=CascadeType.PERSIST)
> private Master master;
> }
>
>
