Re: Core Data troubles - not removing objects
Re: Core Data troubles - not removing objects
- Subject: Re: Core Data troubles - not removing objects
- From: Adam Swift <email@hidden>
- Date: Thu, 1 Nov 2007 15:40:42 -0700
On Nov 1, 2007, at 2:04 AM, Benjámin Salánki wrote:
Hi all,
I am pretty lost in the development of my app which uses Core Data
and an SQLiteStore. I hope someone can point me towards the obvious
point I am missing.
Given are two entities with bidirectional 1-to-1 relationships set
to cascade upon deletion. The first entity contains strings and the
other one contains binary data (like images and stuff). I set up two
NSArrayControllers in IB and made the second one contain a set of
the selected item from the first and also set the Deletes objects on
remove checkbox in the Inspector.
My problem is that if I send the remove: or removeObject: message to
the first NSArrayController and then query said item if it is
isDeleted, I get true for the item itself, but false for the item
connected through the relationship. I then manually removed the
second object by sending a removeObject: message to it. Calling
isDeleted now returns true.
The cascade delete rule isn't processed until you save the managed
object context in which you made the change, you can force the delete
rule processing by calling processPendingChanges. I believe this is
mentioned in the release notes here: http://developer.apple.com/releasenotes/Cocoa/CoreDataReleaseNotes/index.html
All is nice except the SQLiteStore file does not get reduced in
size. I guess that somehow I am doing something wrong and the
objects do not get removed form the object graph at the next save:
operation.
The sqlite database file format won't grow and shrink in response to
every change you make, for performance reasons data is mapped to pages
which may contain many individual data records (or a single data
record can span many pages).
Is there anything obviously wrong or missing from my way of handling
this? I could post some code if required.
Thanks,
ben
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