Envers and parent / child relationship
Chris Richards
to up the version of the parent entity if a property on a child entity
is modified? For example, if I had a Quote parent entity with a
collection of QuoteDetail child entities, when a property on a
QuoteDetail is modified then both QuoteDetail and the parent Quote
have their revision number updated.
Fabio Maulo
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Fabio Maulo
Roger Kratz
Without knowing why you want this, maybe this thread http://community.jboss.org/message/567412 (the thread is true also for NHibernate Envers) can give you some understanding about this.
/Roger
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Från: nhu...@googlegroups.com [nhu...@googlegroups.com] för Fabio Maulo [fabio...@gmail.com]
Skickat: den 14 mars 2011 18:54
Till: nhu...@googlegroups.com
Ämne: Re: [nhusers] Envers and parent / child relationship
Envers is not about "single entity version", it is about "whole domain state version".
The REV in Envers is like the revision in SVN.
A revision is about the state of the whole domain under audit.
On Mon, Mar 14, 2011 at 1:08 PM, Chris Richards <chris.r...@yellowfeather.co.uk<mailto:chris.r...@yellowfeather.co.uk>> wrote:
Using Envers, if I have a parent / child relationship is it possible
to up the version of the parent entity if a property on a child entity
is modified? For example, if I had a Quote parent entity with a
collection of QuoteDetail child entities, when a property on a
QuoteDetail is modified then both QuoteDetail and the parent Quote
have their revision number updated.
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Chris Richards
changes, and I think it would be best to show or access this via the
parent entity. As suggested in the link Roger gave, a better solution
would be to be able to get all the revisions for a parent entity and
its child entities in a single query. So you could have something
like:
auditReader.GetRevisions<Quote>(quoteId, q => q.Details);
which would return the revisions for a Quote and all the revisions for
the associated QuoteDetails.
Would it be possible to implement this using an AuditQuery?
Chris
> Without knowing why you want this, maybe this threadhttp://community.jboss.org/message/567412(the thread is true also for NHibernate Envers) can give you some understanding about this.
>
> /Roger
>
> ________________________________
> Från: nhu...@googlegroups.com [nhu...@googlegroups.com] för Fabio Maulo [fabioma...@gmail.com]
> Till: nhu...@googlegroups.com
> Ämne: Re: [nhusers] Envers and parent / child relationship
>
> Envers is not about "single entity version", it is about "whole domain state version".
> The REV in Envers is like the revision in SVN.
> A revision is about the state of the whole domain under audit.
>
> Using Envers, if I have a parent / child relationship is it possible
> to up the version of the parent entity if a property on a child entity
> is modified? For example, if I had a Quote parent entity with a
> collection of QuoteDetail child entities, when a property on a
> QuoteDetail is modified then both QuoteDetail and the parent Quote
> have their revision number updated.
>
> --
> You received this message because you are subscribed to the Google Groups "nhusers" group.
> To post to this group, send email to nhu...@googlegroups.com<mailto:nhu...@googlegroups.com>.
> For more options, visit this group athttp://groups.google.com/group/nhusers?hl=en.
Roger Kratz
If Envers would offer an API like your proposal, I would guess it wouldn't take long before it ain't enough... Probably someone needs q.Detail.DetailInfo to be included as well -> you need to be able to define a big tree of entities. I will think about this...
Anyhow, even today you should probably be able to do what you want if you get the revisions for your quote entity followed by a query (queries ?) to get appropriate revisions for quotedetails. Have a look at https://bitbucket.org/RogerKratz/nhibernate.envers/src/9ecad0c2289a/Src/NHibernate.Envers.Tests/Integration/Query/RevisionConstraintQueryTest.cs.
Then you will have all affected revisions for Quote and QuoteDetails.
I don't say this is optimal though. A first good step for this situation would be to port audit strategy (http://216.121.112.228/browse/NHE-1) which gives the user the possibility not only persist an audit date but also an end date. That way queries like this would be easier. I hope I will find the time for this port "soon" (day, week or month - don't know ;)).
/Roger
Fabio Maulo
--
Fabio Maulo
Chris Richards
the API. Not sure if it has been implemented in the Java version, but
that is what was suggested in the thread that you linked to earlier.
I have a real need for versioning and will look at prototyping
something in the next week or so. As it stands at the moment your port
of Envers will be a great help, and the validity audit strategy, when
it comes, even more so.
Thanks,
Chris