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From: Henno Vermeulen <henno@huizemolenaar.nl>
To: "'users@openjpa.apache.org'" <users@openjpa.apache.org>
Date: Wed, 26 Sep 2012 11:19:51 +0200
Subject: RE: How to add children to disconnected entity?
Thread-Topic: How to add children to disconnected entity?
Thread-Index: Ac2baY/J3Rt7NeD5R1qBqoPeZkvrSAAVluQw
Message-ID: <1C448C478A6B4743AF19DBC3C3DCE1320394ACBC9FEC@HMS.hm.local>
References: <506229EF.9000004@spudsoft.co.uk>
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Hi,

I verified this situation by making an extra unit test in our system. We al=
ways work with detached entities as well. The test works fine for me.

One explanation for this behavior is that the @OneToMany field does not use=
 "fetch =3D FetchType.EAGER" because relations are lazily fetched by defaul=
t. (Or alternatively you have not included the field in OpenJPA's FetchPlan=
 before calling entityManager.merge which has the same effect as FetchType.=
EAGER even if the @OneToMany field is not eager).

When I adjust my test to lazily fetch the field, then saving a new Assessme=
nt somehow DOES cascade merge new AssessmentResults. However when I merge a=
n existing Assessment that has one existing AssessmentResult and one new As=
sessmentResult, OpenJPA will not cascade merge it.

-----Oorspronkelijk bericht-----
Van: Jim Talbut [mailto:jtalbut@spudsoft.co.uk]=20
Verzonden: woensdag 26 september 2012 0:02
Aan: 'users@openjpa.apache.org'
Onderwerp: How to add children to disconnected entity?

Hi,

I have a pair of entities: Assessment & AssessmentResults, with a=20
One-to-Many relationship (an assessment can have many results).
The Assessment is modified whilst disconnected (outside of a transaction).

Is there any way to have AssessmentResults added whilst the Assessment=20
is disconnected be persisted automatically when the Assessment gets merged?
Setting CascadeType.Merge doesn't seem to do it (I think that merges=20
existing children, not adds new children).

Thanks

Jim