Core Data, NSArrayController and remove:
Core Data, NSArrayController and remove:
- Subject: Core Data, NSArrayController and remove:
- From: "Stephen F. Booth" <email@hidden>
- Date: Tue, 17 Oct 2006 00:36:43 -0700
Hi All,
I'm working on my first Core Data app, so please bear with me! I've
run into something that took me quite by surprise, and although I
assume this is how things work with Core Data I'm not sure I
understand why.
I've modeled two entities: AudioStream and Playlist. Each has an
optional, to-many relationship called playlists and streams,
respectively. Using IB I've created two tables in a view, one for
displaying streams and one for displaying playlists. As a next step,
I created add and remove buttons for adding and removing streams to
playlists. Add has some custom logic but remove I initially wired to
the NSArrayController's remove: selector.
Here is what caught me off guard:
When displaying streams for a given playlist, and the remove button
is clicked, the streams relationship (of the Playlist entity) is
modified- the AudioStream object is removed- but the playlists
relationship (of the AudioStream entity) remains unchanged. It seems
the array controller is only invalidating half of the relationship.
I'm not sure why this is happening; the code
playlistSet = [streamObject mutableSetValueForKey:@"playlists"];
[playlistSet removeObject:playlistObject];
modifies both the playlists and inverse streams relationship.
Is there some property I should be setting on the NSArrayController
to have it modify both relationships?
Thanks,
Stephen
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