Re: Owns Destination & Deny
Re: Owns Destination & Deny
- Subject: Re: Owns Destination & Deny
- From: David Avendasora <email@hidden>
- Date: Fri, 6 Mar 2009 14:46:25 -0600
On Mar 6, 2009, at 2:19 PM, Ramsey Gurley wrote:
On Mar 2, 2009, at 3:20 PM, Chuck Hill wrote:
On Mar 2, 2009, at 7:05 AM, David Avendasora wrote:
Hi all, mostly my future self.
When I have a relationship setup that has the following settings:
1) Owns Destination
2) Delete Rule of Deny
3) Inverse relationship is Optional (I think this should be
impossible if the object is owned)
I get the following error when I try to delete an instance:
java.lang.IllegalStateException: undo: undo manager is in invalid
state, undo was called with too many nested undo groups
I don't know if this impacts anything other than Java Client, but
I've run into it several times and every time I search on this, I
only find my posts.
Would it make sense to have a validation rule in Entity Modeler
that the inverse relationship of an "Owns Destination"
relationship cannot be optional?
I can't think of any case where it being optional would be
correct. That sounds like a good validation. File 'em Dano.
Chuck
After thinking about this a bit more, I think the problem with the
relationship here is the Deny, not the optional reverse. If the
whole point of Owns Destination is to delete the child object when
its relationship to parent is set to null, then requiring mandatory
on the parent relationship defeats the purpose of Owns Destination,
no? The relationship could never be set to null... What would be
the point of setting Owns then?
I think I now understand. One is a validation rule (optional/required)
the other is a behaviour rule (owns destination). The behaviour
(deleting the child object) will happen before the validation runs.
This way you can simply remove an child from the parent, even though
the parent is required, and it will be deleted for you automatically
and never trigger the validation exception.
Dave
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