Hi John,
no hierarchies are not supported. This is one of the things lacking.
You'll have to do some custom coding. Of course you will not be able
to create the table structure from the install method, but you should
be able to restore, save and delete your beans to the single table.
Excess columns should simply be ignored. For ease of use, I'd create
DAO that handled the type column and has appropriate methods to
handle each type. If you design these methods properly, you shouldn't
even need to cast.
I know that this isn't much help, but I hope it still provided you
with some useful info.
Best regards,
Geert
On 23 May 2006, at 18:34, JohnT wrote:
Geert Bevin <gbevin <at> uwyn.com> writes:
Thanks for this information Ronny, we discussed this on IRC and
indeed
it sounds like a worthwhile addition that wouldn't even be that much
work. We'll try to implement it by the 0.9 release.
Best regards,
Geert
--
Hi Geert. I was looking for information on using Rife persistence
(in custom
code and using CRUD) on a class hierarchy. This is the closest
thing I
found. So, does Rife now have any support for mapping hierarchies of
persisted beans? If so, where can I find more information on that?
If not, is there a strategy that you would recommend? I would be
inclined to
try the single-table approach
(http://www.agiledata.org/essays/
mappingObjects.html#MapHierarchyToTable), and
see how ugly that gets. To use a ContentQueryManager, I think that
would mean
that I need a superset bean that does all the db stuff, which I can
cast to
the subclasses based on the type field(s). I'm scared, I must be
missing
something?
Thanks,
- JT
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