[nhibernate-issues] [JIRA] Commented: (NH-826) Using Criteria to query for an item throws on Flush in some situations

[NHibernate J. <mik...@us...>]

     [ http://jira.nhibernate.org/browse/NH-826?page=comments#action_14500 ]
     
Aaron Jensen commented on NH-826:
---------------------------------

Oops, just realized I accidentally set this as a Blocker priority, sorry about that.  It is blocking us from migrating to 1.2, so I'd love to see it fixed sooner than later, but it is hardly a full-on Blocker.

> Using Criteria to query for an item throws on Flush in some situations
> ----------------------------------------------------------------------
>
>          Key: NH-826
>          URL: http://jira.nhibernate.org/browse/NH-826
>      Project: NHibernate
>         Type: Bug
>   Components: Core
>     Versions: 1.2.0.Beta2
>     Reporter: Aaron Jensen
>     Priority: Blocker
>  Attachments: NHibernateTest.zip
>
> The situation is best described by the attached sample project, but I will attempt to explain in words when this problem occurs.
> EntityA has a many-to-many to EntityB
> EntityB has a subclass EntityC
> EntityC has a one-to-many to EntityD
> If you create an EntityB and associate it to EntityA, then query for EntityA via Criteria (but not via HQL) then Session.Flush() will fail with: 
> NHibernate.HibernateException: You may not dereference an collection with cascade="all-delete-orphan"
>    at NHibernate.Impl.SessionImpl.UpdateUnreachableCollection(IPersistentCollection coll) in c:\net\nhibernate\nhibernat
> e\src\NHibernate\Impl\SessionImpl.cs:line 3957
>    at NHibernate.Impl.SessionImpl.FlushCollections() in c:\net\nhibernate\nhibernate\src\NHibernate\Impl\SessionImpl.cs:
> line 3802
>    at NHibernate.Impl.SessionImpl.FlushEverything() in c:\net\nhibernate\nhibernate\src\NHibernate\Impl\SessionImpl.cs:l
> ine 3090 
> The collection it is complaining about is a collection of EntityD objects which should never have been created in the first place.

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