On 8 Jan 2013, at 05:53, Martin Hewitson wrote:
>
> On Jan 7, 2013, at 08:44 PM, Mike Abdullah <cocoa...@mikeabdullah.net> wrote:
>
>>
>> On 7 Jan 2013, at 16:35, Martin Hewitson <martin.hewit...@aei.mpg.de> wrote:
>>
>>> Hi Francisco,
>>>
>>> Thanks for the feedback!
>>>
>>> What you suggest sounds like it might fix the problem, but I'm wondering
>>> how best to do this. Currently I'm just calling -remove: on the tree
>>> controller to delete the selected object(s). Of course, if I clear the
>>> selection first, then -remove: doesn't do anything. I can grab an array of
>>> the selected objects before clearing the selection then use
>>> NSManagedObjectContext's -deleteObject:. So something like this:
>>>
>>> // get a pointer to the selected items
>>> NSArray *items = [self selectedObjects];
>>>
>>> // clear selection
>>> [self setSelectionIndexPaths:@[]];
>>>
>>> // now delete from the MOC
>>> for (NSManagedObject *item in items) {
>>> [self.managedObjectContext deleteObject:item];
>>> [self.managedObjectContext processPendingChanges];
>>> }
>>>
>>> Does that look sensible to you?
>>
>> Why are you calling -processPendingChanges at each iteration of the loop?
>> Calling it yourself is rarely needed, and best done only with justification.
>>
>
> I read in that thread that I referenced (I think) that it may be necessary to
> do this to avoid/handle objects being deleted twice (if a parent and child
> are selected, then deleted). To be honest, I'm just trying things to see what
> works. Since this problem only occurs on 10.6.8, I think I'm looking for a
> work-around.
Hmm. In my case I go to some lengths to figure out which objects don't need to
be deleted, because an ancestor has already been deleted. It does seem simpler
your way.
I wonder though — I don't believe there is any harm in asking Core Data to
delete an object that's already been marked for deletion. And indeed, you code
is doing that. The difference the -processPendingChanges call makes is that
handling the delete rule will happen during that call, so child objects are
already marked for deletion.
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