David, thank you for your answer!
Its not only a business rule for us but also a matter of data integrity.
Usually we implement constraint-checks for the frontend for validation
of user input.
Then occasionally as business rule, and finally as as data constraint.
I really think about the data integrity aspect here.
The Observer/Listener way seems a little tedious.
Thanks also for the hint about contains, my collegue says contains dont
works for partial words wich we really need for suggestions.
"a tit" would suggest "a title". Is there a way to search partial words,
for example can we reconfigure lucene?
thanks,
Roland
David Nuescheler schrieb:
hi roland,
in jcr there is no constraint for uniqueness of a property. given
the inheritance of nodetypes this is a slightly more complicated
idea than with tables of an rdbms.
also i find it questionable to introduce a constraint to check
uniqueness of a title (i assume a string property) a bit questionable
on the data layer (the repository, in this case). i would suggest to
do this on an application layer. what do you think?
regards,
david
On 11/21/05, Roland Kofler <[EMAIL PROTECTED]> wrote:
Hi all, we would like to introduce a constrain for our Title property
that asserts its uniqueness.
We want to do this as close to the datalayer as possible - in analogy to
column constrains in rdbms'.
The only method we came up to, is binding an Listener to the
ObserverManager.
a) Are there better ways to constrain properties?
b) If not, what is the best way to get the property that fired the event?
Is there a way to get the item that fired the event in the callback
method? Didn't find a solution for this.
By now we register the event to the second ancestor node 'pages',
which contains a 'page' and
look up in the callback if a 'title' change fired the event.
so we get a path "/s1:pages/page[2]/s1:title" among other property
changes.
Thank you for your help!!
Roland Kofler
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