Core Data: where is the default store in a CD-Document-Based-App?
Core Data: where is the default store in a CD-Document-Based-App?
- Subject: Core Data: where is the default store in a CD-Document-Based-App?
- From: Peter Laurens <email@hidden>
- Date: Tue, 23 Aug 2005 15:04:02 +0100
Hi,
I'm building my first Core Data app, so be gentle ;)
Problem:
------------
I had a relatively simple Core Data Document Based App all set up.
Naturally XCode sets me up a decent starting point, and I just draw
my data model and everything is handled for me. This was great - and
obviously there's a persistent store set up automagically for me,
because I can save my data in my app without any work. Well - I say
'obviously' but this is an assumption because... I can't seem to
'find this original persistent store...
I do :
- (void)windowControllerDidLoadNib:(NSWindowController *)
windowController
{
NSPersistentStoreCoordinator *documentStoreCoordinator = [[self
managedObjectContext] persistentStoreCoordinator];
NSLog(@"Number of stores is %d", [[documentStoreCoordinator
persistentStores]count]);
}
In MyDocument, and NSLog prints '0'. Whereas I would expect it to say
'1'. Because there's something there saving my stuff (unless I'm
imagining things).
Why do I want to know about this?:
-----------------------------------------------
Well, I'd like to know more about this 'default' automagic store
because as my app progressed I had need to create an in-memory store
for a certain type of object that I don't need to save. That was all
very simple to do.
But seems to have thrown my app a bit of a wobbly.
After I create the in-memory store ([documentStoreCoordinator
addPersistentStoreWithType:NSInMemoryStoreType configuration:nil
URL:nil options:nil error:&error];) nothing gets saved when I call
the 'save' command from the File menu in my app.
So I assume that everything is going, by default, into the in-memory
store. Which has taken precedence for use over the 'default' original
store that was used before I started messing with the persistent
stores in code.
So I'd like a way to call assignObject:toPersistentStore: and assign
all things I want to whatever it is that's set up to store my things
for me in a fresh Core Data app (the store I can't manage to 'find')
- if that makes sense.
One thing I did try was just to create another store to handle the
stuff that needs to be saved - duplicating the automatically provided
CD-Document-Based-App functionality by making my own persistent store
for stuff to save, as WELL as the in-mem store for stuff I didn't
want saved. This had me quickly tying myself in knots because such a
store needs an URL for its store - and in a document based app I'll
need to manually make a different URL for each store to make sure
documents don't step on each other's stores, and handle the cleanups
etc. etc. etc. Well... it just seemed like a totally wrong and non-
Cocoa thing to do.
@finally:
------------
All simple stuff for many of ya I'm sure. But any help offered on
getting my head around these issues would be so very gratefully
received...
Thanks in advance!
- Pete
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