Hi David,
Did you find a solution?
Just a question: Why would you not use a standard service action to
create the copy? Is there any reason why you want Datanucleus to do it?
Personally, I would try and use a service that creates a copy of the
current records and updates the public reference instance to always
point to the latest (perhaps use a Proxy, for example - and another
administrative view that displays the full set of changes over time).
Cheers,
Kevin
On 2017-03-08 06:05, David Tildesley wrote:
Hi,
I have a need to keep public records and to be able to edit objects
and put them through a publishing lifecycle whilst public can view the
current record without seeing the changes.
Temporal object pattern [1] seems like the simplest pattern.
Then it comes down to how hard or easy it is to simply copy a
components entire object graph to make a new version (don't really
care about the duplication of data that hasn't change from version to
version).
Datanucleus has some support for coping an object graph from one
repository to another - I assume you can copy to the same repository
to achieve what I want to do.
Krypo [2] seems like it is being used by Datanucleus.
Anyways - how to do this with ISIS? Any suggestions appreciated.
Some context:
A Building (component) has a current FireSafetyCertification
(component) and is published as a public record and these records are
kept for 10 years. A change to a record that is viewable by the public
is regarded as a new public record. Overtime (slowly) these
FireSafetyCertificates may expire/withdrawn/change in detail. But when
they are published they constitute a public record. Building has
names, addresses, images, parts, construction details, etc. whilst
FireSafetyCertification has documents, exemption notices, expiry dates
etc.
Using the Temporal Object pattern, a Building object has 1..*
BuildingVersion and all of the Building's detail hangs off
BuildingVersion.
Any other suggestions instead of Temporal Object pattern also
appreciated.
[1] https://martinfowler.com/eaaDev/TemporalObject.html
[2] http://camposha.info/source/java-kryo/
Thanks!
David.
