Re: addObjectToBothSides... and setValue
Re: addObjectToBothSides... and setValue
- Subject: Re: addObjectToBothSides... and setValue
- From: Owen McKerrow <email@hidden>
- Date: Tue, 15 Feb 2005 15:31:08 +1100
Drew,
If you are adding more info to your join table than just the ID's of
the other 2 tables then you won't be able to use Flattened
relationships, which is what Im assuming you are doing. That's how your
addObjectToBothSidesOfRelationship is working, it is creating the join
table object for you, thats why you never see it.
You would have to change the code to something like :
NSArray tempClassList = schoolItem.classes();
int count = tempClassList.count();
Class tempClassList = (Class) tempClassList.objectAtIndex(0);
for(int i = 0 ; i < count ; i++) {
//Make a new classStudent Object
//Note you can override ClassStudents awakeFromInsertion method to
set up any default values.
ClassStudent newJoin = (ClassStudent)
EOUtilities.createAndInsertInstance(ec,"ClassStudent");
((Session)session()).currentStudent().addObjectToBothSidesOfRelationship
WithKey(newJoin,"classStudent");
((Class)
tempClassList.objectAtIndex(i)).addObjectToBothSidesOfRelationshipWithKe
y(newJoin, "classStudent");
}
ec.saveChanges();
Owen
On 15/02/2005, at 2:56 PM, Drew Thoeni wrote:
I'm setting the relationship between a student and his classes. This
is a many-to-many join (students to classes) so I'm interating through
to set each relationship. I suppose that's correct.
Background: I'd also like to set a value on the newly inserted
relationship row. For example, I have a lastAttemptedContactTime in
this many-to-many join so I know when I last sent an email to this
student for this class.
Question: How to easily set a value for each item in the many-to-many?
I may be missing something here, but at the time the relationship is
set, I don't think I have a classStudent (the many-to-many object)
available to me. Or is there a way to have that object in hand so I
could then just set the value?
Regards,
Drew
NSArray tempClassList = schoolItem.classes();
int count = tempClassList.count();
Class tempClassList = (Class) tempClassList.objectAtIndex(0);
for(int i = 0 ; i < count ; i++) {
((Class)
tempClassList.objectAtIndex(i)).addObjectToBothSidesOfRelationshipWithK
ey(session.currentStudent, "students");
}
ec.saveChanges();
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Owen McKerrow
WebMaster, emlab
http://emlab.uow.edu.au
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