Re: When do I use addObjectToBothSidesOfRelationshipWithKey?
Re: When do I use addObjectToBothSidesOfRelationshipWithKey?
- Subject: Re: When do I use addObjectToBothSidesOfRelationshipWithKey?
- From: Tom Jones <email@hidden>
- Date: Fri, 3 Sep 2004 09:05:50 -0500
Thank you,
Just to clarify...
I have an app that is similar in design to the Author/Book example in
Apple's documentation. So the first row of the table the user enters
the info, and the second row is a WORepetition that shows all of the
items(in this case reqs).
In the input row, I bind everything to the various fields in a req.
req.status is bound to a WOPopup's selection. I take it from your
email that it would be better to have an object for each of the
Relationships, and bind the inputs to these objects and then make the
association. So for instance, bind aStatus to the WOPopup's selection,
and then call aStatus.addObjectToBothSidesOfRelationshipWithKey(req,
"reqs"); Right?
Thanks,
Tom
On Thu, 2 Sep 2004 14:00:38 -1000, Art Isbell <email@hidden> wrote:
>
>
> On Sep 2, 2004, at 1:00 PM, Tom Jones wrote:
>
> > The code below is my attempt to preserve the following relationships
> > project<-->>req
> > reqpriority<-->>req
> > status<-->>req
> > reqtype<-->>req
> >
> > a project owns its reqs
> >
> > if a reqpriority, status or reqtype is deleted, the req's
> > corresponding value should be null.
> >
> > given that is all of this code necessary?
> >
> > session.defaultEditingContext().insertObject(req);
> > req.reqpriority().addObjectToBothSidesOfRelationshipWithKey(req,
> > "reqs");
> > req.status().addObjectToBothSidesOfRelationshipWithKey(req, "reqs");
> > req.reqtype().addObjectToBothSidesOfRelationshipWithKey(req, "reqs");
> > project.addObjectToBothSidesOfRelationshipWithKey(req,"reqs");
> > session.defaultEditingContext().saveChanges();
>
> Statements 2 - 4 imply that req.reqpriority, req.status, and
> req.reqtype have already been set, so there's no need to set them again
> (however, property values should in general be set after only an object
> is inserted). If they haven't been set, statements 2 - 4 should throw
> a null exception.
>
> If you have reqpriority, status, and reqtype objects, statements 2 - 4
> should be:
>
> reqpriority.addObjectToBothSidesOfRelationshipWithKey(req, "reqs");
> status.addObjectToBothSidesOfRelationshipWithKey(req, "reqs");
> reqtype.addObjectToBothSidesOfRelationshipWithKey(req, "reqs");
>
> Aloha,
> Art
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