I have a Core Data application with a double Core Data implementation,
that is, there are two managedObjectModels, persistentStoreCoordinators
and managedObjectContexts.
These are referenced by the following methods:
// appDelegate.h
- (NSPersistentStoreCoordinator *)
persistentStoreCoordinatorForConfiguration: (NSString *) configuration;
- (NSManagedObjectModel *) managedObjectModelForConfiguration: (NSString
*) configuration;
- (NSManagedObjectContext *) managedObjectContextForConfiguration:
(NSString *) configuration;
- (NSManagedObjectContext *) managedObjectContextIpAddresses; // used for
bindings
- (NSManagedObjectContext *) managedObjectContextRecipes; // used
for bindings
To make the code cleaner and generic for N objectContexts, I'd like to
have them all in an NSDictionary, and bind to the dictionary instead.
So, I'd have
- (NSMutableDictionary *) managedObjectContextDictionary;
which I fill in the appDelegate's init (to do it as early as possible) as
follows:
- (id) init
{
self = [super init];
if (self != nil)
{
managedObjectContextDictionary = [[NSMutableDictionary
alloc] init];
persistentStoreCoordinatorDictionary = [[NSMutableDictionary
alloc] init];
managedObjectModelDictionary = [[NSMutableDictionary
alloc] init];
NSArray * keys = [NSArray arrayWithObjects:
recipesConfigurationKey,
ipAddressesConfigurationKey, nil];
for(unsigned int i = 0; i < [keys count]; i++)
{ // we do this because of the bindings
NSString * key = [keys objectAtIndex: i];
[managedObjectContextDictionary setObject: [self
managedObjectContextForConfiguration: key] forKey: key];
}
}
return self;
}
Problem: when I use this, and bind to
managedObjectContextDictionary.recipes and
managedObjectContextDictionary.ipAddresses, the application *sometimes*
hangs after startup. That is, the interface does not work, and there is no
spinning ball either; it is just dead.
When using the debugger, it does work OK.
I checked that the whole Core Data implementation is set up, as well as
the dictionary.
Questions:
1. What could be the difference with binding to
- (NSManagedObjectContext *) managedObjectContextRecipes
{
return [self managedObjectContextForConfiguration:
recipesConfigurationKey];
} ?
2. Is it correct to set up the dictionary in - init?
3. Could there be a timing problem?
Thanks in advance,
Arthur C.
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