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    <p>I think, it is <strong>bad idea</strong>. Because it's OOP-ugly. What do I suggest? You should make a singleton class <code>SharedStorage</code> like this:</p> <pre><code>+ (SharedStorage*)sharedStorage { static SharedStorage* _sharedStorage = nil; static dispatch_once_t onceToken; dispatch_once(&amp;onceToken, ^{ _sharedStorage = [[self alloc] init]; }); return _sharedStorage; } - (SharedStorage*)init { self = [super init]; if (self) { [self setupPersistentStoreCoordinator]; } return self; } - (NSManagedObjectModel*)__managedObjectModel { if (_managedObjectModel_ == nil) { NSBundle *mainBundle = [NSBundle mainBundle]; NSURL *modelURL = [mainBundle URLForResource:@"yourURL" withExtension:@"momd"]; _managedObjectModel_ = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL]; } return _managedObjectModel_; } - (void)setupPersistentStoreCoordinator { if (_storeCoordinator != nil) return; NSString *storePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"YourDB.sqlite"]; NSURL *storeUrl = [NSURL fileURLWithPath:storePath]; NSError *error; _storeCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self __managedObjectModel]]; if (![_storeCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); } } </code></pre> <p>And everywhere you want to use context you have to create a new <code>NSManagedObjectContext</code> with the same <code>persistentStoreCoordinator</code>:</p> <pre><code>self.context = [NSManagedObjectContext new]; self.context.persistentStoreCoordinator = [[SharedStorage sharedStorage] storeCoordinator]; </code></pre>
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    1. POImport AppDelegate into models?
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    1. USValentin Shamardin
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    1. COGood answer, but singleton is also a bad idea.
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    2. CO@pbibergal, Why not? :)
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    3. COSingleton is anti-pattern. It is as bad as global.
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