Correct way to map Core Data relationship

Question

I have two objects I need to create a relationship between in Core Data. I am not sure how to setup the relationship. When I try I then run my app it loops forever and crashes (guessing circular reference).

mainObject.h

NSString *userId;
NSString *thing;
NSString *descr;
NSString *title;

authObject.h

NSString *userId;
BOOL     alive;
BOOL     authCode;

How do I setup this relationship in CD? mainObject can have multiple authObjects. How do I relate userId on both objects to each other in CD?

What does your data model look like? Relationships are defined there, and the properties and ivars are generated automatically in your managed object subclass files. — jrturton, Jun 11 '12 at 15:40
mainObject has-many authObjects (see above for their attributes). The relationship on mainObject side is "auths" and the relationship (inverse) on the authObjects is "main". — jdog, Jun 11 '12 at 19:10
Something similar here, but I think I can figure it out from this post stackoverflow.com/questions/9318565/restkit-object-mapping-relationships-without-kvc/9318745#9318745 — jdog, Jun 11 '12 at 19:52
It's not clear where your problem is. Core data relationships are just properties on an object - for example, you'd set the `main` property on your authObject to an instance of `mainObject` and boom - you're done. Can you include some of the code you are trying that is causing you difficulties? — jrturton, Jun 11 '12 at 20:05
Answered: http://stackoverflow.com/questions/9318565/restkit-object-mapping-relationships-without‌-kvc/9318745#9318745 — jdog, Jun 11 '12 at 21:54
Please answer your question with the solution you found and set it as marked. Thank you. — Lorenzo B, Jun 11 '12 at 22:04
I'm not sure how that does answer your question, since it is about Restkit, which you haven't mentioned, but you know best! — jrturton, Jun 12 '12 at 05:44

score 0 · Accepted Answer · edited May 23 '17 at 12:03

0

I am using restkit and my scenario is identical to this

As for the CoreData side, I figured it out by reading through that post and filling in the gaps. Mainly, I had it pretty much right, but that post confirmed my suspicions.

Not sure how to mark this as answered.

edited May 23 '17 at 12:03

Community

1
1

answered Jun 12 '12 at 13:21

jdog

10,351
29
90
165

Just click the grey check box under the vote box to accept your own answer. – James Webster Jun 12 '12 at 13:22

Correct way to map Core Data relationship

1 Answers1