Re: Creating a managed object without adding it to the context?
Re: Creating a managed object without adding it to the context?
- Subject: Re: Creating a managed object without adding it to the context?
- From: "Sean McBride" <email@hidden>
- Date: Mon, 26 Jan 2009 14:30:56 -0500
- Organization: Rogue Research Inc.
On 1/26/09 12:21 PM, Ulai Beekam said:
>> IIRC that happens when you insert the object directly into the managed
>> object context without going through the array controller.
>>
>> I.e. by using NSManagedObject's
>>
>> -initWithEntity:insertIntoManagedObjectContext:
>>
>> instead of NSArrayController's
>>
>> -addObject:
>
>This is actually what I'm most interested about, and the reason why I
>asked my question in the first place. Can someone else here confirm
>this? Let me repeat what is to be confirmed: When a new managed object
>is added to the managed object context (NB: Directly going through to
>the context and NOT using arrayController's add: methods), is it true
>that the arrayController will not select that particular object?
>
>If this is true, it seems strange to me, as this new object will get
>propagated to the arrayController and hence the arrayController should
>detect that it is a newly added object and therefore select it
>automatically, right?
>
>Remember that throughout this discussion we assume that the "select on
>insert" checkbox is checked for the arrayController.
I know what you're talking about. You want to create a new object, you
want it to appear in the table, you want it to be selected, and you also
need to set some attributes/relationships that you cannot in awakeFromInsert.
The problem is that NSArrayController's -addObject: does not return to
you the pointer to the new managedobject, and so you cannot customise
it. OTOH, if you use -initWithEntity:insertIntoManagedObjectContext:,
then it won't be selected in the arraycontroller/table.
I have been looking for the best solution for some time now.
Here's something I read recently on the topic:
<http://boredzo.org/blog/archives/2008-11-26/how-to-work-with-a-bound-to-
array>
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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