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POHow to recreate persistentStore not to be affected by changing .xcdatamodeld
 

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  1. POHow to recreate persistentStore not to be affected by changing .xcdatamodeld
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    <p>I'd like to recreate (drop &amp; create) persistentStore not to be affected by changing .xcdatamodeld.</p> <p>I wrote a code persistentStoreCoordinator in AppDelegate likes below:</p> <pre><code>- (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (_persistentStoreCoordinator != nil) { return _persistentStoreCoordinator; } _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"myproject.sqlite"]; // delete if database exists NSError *error = nil; if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&amp;error]) { // if .xcdatamodeld is changed, fail and in here... // if not changed, recreate success. all data removed from database NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } NSArray *stores = [_persistentStoreCoordinator persistentStores]; for (NSPersistentStore *store in stores) { [_persistentStoreCoordinator removePersistentStore:store error:nil]; [[NSFileManager defaultManager] removeItemAtPath:store.URL.path error:nil]; } // newly create database if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&amp;error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return _persistentStoreCoordinator; } </code></pre> <p>when I make a change to <code>.xcdatamodeld</code> (ex. adding new column to entity) and reboot simulator, then fail at first <code>addPersistentStoreWithType</code> and log says</p> <pre><code>Unresolved error Error Domain=NSCocoaErrorDomain Code=134100 The operation couldn’t be completed. (Cocoa error 134100.) </code></pre> <p>How can I do that?</p>
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