Importing Data using MagicalRecord

I'm using MagicalRecord to import data from plist. I'm using code less import as explained in this tutorial Importing Data Made Easy. I have two entities Manufacturer and Car, they have one to many and one to one relation respectively. Plist structure This import work fine ``` NSArray *manufacturers = ... [MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) { [manufacturers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { [Manufacturer MR_importFromObject:obj inContext:localContext]; }]; } completion:^(BOOL success, NSError *error) { }]; ``` But this is not getting imported ``` [MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) { [Manufacturer MR_importFromArray:manufacturers inContext:localContext]; } completion:^(BOOL success, NSError *error) { }]; ``` Any explanation would be highly appreciated. EDIT : Log of manufacturers array ``` [ { "Cars": [ { "CarID": 1, "Name": "Civic" }, { "CarID": 2, "Name": "Jazz" }, { "CarID": 3, "Name": "City" } ], "ManufacturerID": 1, "Name": "Honda" } ] ```