Re: Updating / Replacing Parent Objects
Re: Updating / Replacing Parent Objects
- Subject: Re: Updating / Replacing Parent Objects
- From: Dirk Bajohr <email@hidden>
- Date: Tue, 3 Aug 2004 16:45:54 +0200
Hi Nathan,
Yes, that's a good way in the following case:
aPost has a to-1 relationship to (= is in) aForum - you want to delete
aPost
What to do:
1 EOEditingContext ec = aPost.editingContext();
2 // aPost.removeObjectFromBothSidesOfRelationshipWithKey(aForum,
"forum");
3 ec.deleteObject(aPost);
4 ec.saveChanges();
Ann.: the delete rule will automatically remove the relationship from
aPost to aForum (Step 2) (and vice versa if it exists)
But the original task was:
aPost has a to-1 relationship to (= is in) aForum1 - you want to move
aPost to aForum2
What to do:
1 aPost.removeObjectFromBothSidesOfRelationshipWithKey(aForum1,
"forum");
2 aPost.addObjectToBothSidesOfRelationshipWithKey(aForum2, "forum");
3 aPost.editingContext().saveChanges();
Ann.: if the relationship really is to-1 you can omit Step 1
Cheers,
Dirk
Am 03.08.2004 um 16:16 schrieb Nathan Dumar:
I'm still learning, so tell me if I'm wrong ...
Instead of using removeObjectFromBothSidesOfRelationshipWithKey, I
usually just set the eomodel's Delete Rule to Nullify the relationship
when an object is deleted.
Nathan
On Aug 1, 2004, at 6:48 PM, Dirk Bajohr wrote:
In a to-1 relationship (I assume you are using that from post to
forum) you don't need to call remove... because a post can only be
applied to 1 forum. If a post can be in more than 1 forum you have to
call (before saving the EC):
myPost.removeObjectFromBothSidesOfRelationshipWithKey(oldForum,
"forum");
But it won't hurt if you call it anyway ;-), I'm just a little bit
lazy. I don't know what other people do, anyone?
Cheers,
Dirk
Am 01.08.2004 um 23:45 schrieb Lotsa Cabo:
Thanks for the reply, Dirk. In your examples above are you assuming
that "removeObjectFromBothSidesofRelationshipWithKey()" has already
been called? I notice you mentioned the method but did not include
it
in either example.
R/S
Ryan
--
Dirk Bajohr
iSOLUTION - Individuelle Software fuer moderne Kommunikation
Hauptstr. 50
53757 Sankt Augustin
T +49 2241 921567-0
F +49 2241 921567-89
http://www.isolution.de
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Dirk Bajohr
iSOLUTION - Individuelle Software fuer moderne Kommunikation
Hauptstr. 50
53757 Sankt Augustin
T +49 2241 921567-0
F +49 2241 921567-89
http://www.isolution.de
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