Re: Problem saving Many-to-Many relationship changes
Re: Problem saving Many-to-Many relationship changes
- Subject: Re: Problem saving Many-to-Many relationship changes
- From: email@hidden
- Date: Wed, 22 Oct 2003 12:45:44 CDT
- Priority: 3 (Normal)
[demime could not interpret encoding binary - treating as plain text]
I don't entirely understand what's going on. It _might_ be an issue of
the 'reciprocal' relationship not working properly. Try using
addObjectToBothSidesOfRelationshipWithKey to modify the relationships, or
else just use the built in WOToManyRelationship or WOToOneRelationship
components for the UI.
It _might_ be an issue with flattened relationships. If you have a
flattened relationship for this many-to-many AND you expose the
intermediate join table---that's no good. You've got to do one or the
other. Use flattened relationships OR expose the join table.
It might also be my current least favorite and hardest to explain WO bug,
involving boolean values. If you have any boolean properties in any of
the three entities involved in the many-to-many, it could be this. See:
http://wodev.spearway.com/cgi-bin/WebObjects/WODev.woa/wa/Main?wikiPage=Weird52EOFBug
for a description of the bug.
See also:
http://wodev.spearway.com/cgi-bin/WebObjects/WODev.woa/wa/Main?wikiPage=EOFCommandments
for a list of some other things that you can do 'wrong' with EOF, that
can cause mysterious problems like the one you are seeing.
Hope this helps,
--Jonathan
On Wed, 22 Oct 2003 13:15:04 +0100 Merul Patel wrote:
> Hi,
>
> I have a component which works fine for editing, inserting and deleting
> EnterpriseObjects of type A.
>
> I've modified it to allow me to also edit a many-to-many relationship
> between EOs of type A and EOGenericRecords of type B, by using a
> WODisplayGroup to fetch all the objects of type B, and then using a
> WOCheckBoxList to assign the selected type B objects to the type A
> object. I've assigned the selections binding for the WOCheckBoxList to
> A.AB many-to-many relationship.
>
> The many-to-many relationship and the WOCheckBoxList appear to be
> configured correctly, and when I commit changes to be saved, the
> changes are committed to the dbase by the
> EOEditingContext.saveChanges() call. However, subsequent edits to the
> many-to-many relationship aren't saved, even though I can see that the
> editingContext has detected the changes by calling
> EOEditingContext.updatedObjects().
>
> If I create another session to the application, then the same thing
> happens. I can make changes to the many-to-many relationship initially,
> but then subsequent changes fail.
>
> The above led me to believe I should refault the objects in the editing
> context, but this has made no changes.
>
> Am I missing something?
>
> TIA,
>
> Merul
> _______________________________________________
> webobjects-dev mailing list | email@hidden
> Help/Unsubscribe/Archives:
> http://www.lists.apple.com/mailman/listinfo/webobjects-dev
> Do not post admin requests to the list. They will be ignored.
_______________________________________________
webobjects-dev mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/webobjects-dev
Do not post admin requests to the list. They will be ignored.