27 Oct
2008
27 Oct
'08
5 p.m.
OK, I am slowly getting there. The status now is that it defaults to
setting the value to null if the "parent" is deleted. The best thing
would be if it was possible to have a cascade delete and maybe even
refuse behavior, too. I'm not sure how to implement that, though... I
don't even know if that is possible without a big rewrite. I guess I
would need a kind of hook into the deleting routine of all objects...
Any ideas?
Thomas
On Sat, Oct 25, 2008 at 12:03 PM, Pascal Voitot
<pascal.voitot.dev(a)gmail.com> wrote:
fully agree with that!
if need any support, don't hesitate to ask... will try to find a few
minutes...
On Fri, Oct 24, 2008 at 6:20 AM, Artem Melentyev <amelentev(a)gmail.com>wrote;wrote:
Hi, Thomas.
I think it is a good idea. It would be very useful for xwiki.
I propose
ReferencePropertyClass (contains reference target
(object,document,attachment), cascade delete options and other
configurations)
ObjectReferenceProperty (reference to BaseObject)
DocumentReferenceProperty (if needed. reference to XWikiDocument)
as name of these properties.
I think "Foreign key" is too technical name for this.
Please create a jira issue (new feature) and attach patches.
Thanks
Thomas McColgan wrote:
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I'm proposing to implement a new property
type: A foreign key,
analogous to the concept in relational databases. Together with custom
mapping, a property like this would make it possible to use Xwiki as a
frontend for a relational database, while making full use of the wikis
capabilities(configurability, history, etc).
The implementation would look similar to the existing "Database list"
on the outside, but it would make a lot more use of the databases
features. If A links to B, and someone deletes B the reference in A
would either be set to null, or the delete would be stopped, depending
on the configuration. It would also make it possible to adress
associated objects directly in hql.
The basic functionality can be emulated using DBList(adding a property
to one object by choosing from existing instances of another class),
but this is not useful if one wants to have "real" foreign key
behaviour in the wiki and the underlying DB. If there is a demand for
this I will be happy to contribute a patch once I am done, and I will
try make the code nice enough to submit. Otherwise I will probably
just make it as a hack to meet the exact need that I have...
Thomas
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Artem Melentyev
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