iPhone Core Data "Automatic Lightweight Migration"
<p>I am attempting to update an app that implements a core data store.  I am adding an attribute to one of the entities. </p>

<p>I added the following code to my delegate class:</p>

<pre><code>- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {

    if (persistentStoreCoordinator != nil) {
        return persistentStoreCoordinator;
    }

    NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"Shoppee.sqlite"]];

    NSError *error = nil;
    persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];

    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
           [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
           [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];

    if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&amp;error]) {
     NSLog(@"Error: %@",error);
     NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
     abort();
    }    

    return persistentStoreCoordinator;
}
</code></pre>

<p>This was from the following URL:
<a href="http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/CoreDataVersioning/Articles/vmLightweight.html#//apple%5Fref/doc/uid/TP40008426-SW1">Doc</a></p>

<p>I get the following error when executing the code:</p>

<blockquote>
  <p>2009-12-01 20:04:22.877</p>
  
  <p>Shoppee[25633:207] Error: Error</p>
  
  <p>Domain=NSCocoaErrorDomain Code=134130</p>
  
  <p>UserInfo=0x1624d20 "Operation could not be completed. (Cocoa error
  134130.)" 2009-12-01 20:04:22.879 Shoppee[25633:207] Unresolved error
  Error Domain=NSCocoaErrorDomain Code=134130 UserInfo=0x1624d20
  "Operation could not be completed. (Cocoa error 134130.)", {
      URL = file://localhost/Users/Eric/Library/Application%20Support/iPhone%20Simulator/User/Applications/A8A8FB73-9AB9-4EB7-8F83-82F5B4467AF1/Documents/MyApp.sqlite;
      metadata =     {
          NSPersistenceFrameworkVersion = 241;
          NSStoreModelVersionHashes =         {
              Item = &lt;869d4b20 088e5c44 5c345006 87d245cd 67ab9bc4 14cadf45
  180251e9 f741a98f>;
              Store = &lt;47c250f4 895e6fd1 5033ab42 22d2d493 7819ba75 3c0acffc
  2dc54515 8deeed7a>;
          };
          NSStoreModelVersionHashesVersion = 3;
          NSStoreModelVersionIdentifiers =         (
          );
          NSStoreType = SQLite;
          NSStoreUUID = "8DC65301-3BC5-42BE-80B8-E44577B8F8E1";
      };
      reason = "Can't find model for source store"; }</p>
</blockquote>

<p>It looks like I somehow need to include the original data model but I am not sure how to do that.  Any suggestions?</p>
