On Dec 23, 2008, at 4:44 PM, Jerry Krinock wrote:
The NSPersistentDocument documentation doesn't give much detail --
"... an NSPersistenDocument creates its own ready-to-use persistence
stack". I presume that it uses -mergedModelFromBundles:?
<http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSPersistentDocument_Class/Reference/Reference.html#//apple_ref/doc/uid/TP30001179-CJBJBIHA
>
managedObjectModel
Returns the receiver’s managed object model.
- (id)managedObjectModel
Return Value
The receiver’s managed object model, used to configure the receiver’s
persistent store coordinator.
Discussion
By default the Core Data framework creates a merged model from all
models in the application bundle ([NSBundle mainBundle]). You can
override this method to return a specific model to use to create
persistent stores. A typical implementation might include code similar
to the following fragment:
NSBundle *bundle = [NSBundle bundleForClass:[self class]];
NSString *path = [bundle pathForResource:@"MyModel" ofType:@"mom"];
NSURL *url = [NSURL fileURLWithPath:path];
NSManagedObjectModel *model = [[NSManagedObjectModel alloc]
initWithContentsOfURL:url];
Normally you would cache the model as an instance variable. If all
your document instances use the same model, however, you can increase
the efficiency of this method by caching a single instance, as
illustrated in the following example.
- (id)managedObjectModel {
static id sharedModel = nil;
if (sharedModel == nil) {
sharedModel = [[super managedObjectModel] retain];
}
return sharedModel;
}
Special Considerations
In applications built on Mac OS X v10.4, by default the Core Data
framework creates a merged model from all the models found in the
application bundle and the frameworks against which the application is
linked.
Availability
• Available in Mac OS X v10.4 and later.
mmalc
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