レコードの取得

// Create a request to fetch all Chefs.

NSEntityDescription *chefEntity = [NSEntityDescription entityForName:@"Chef" inManagedObjectContext:context];

NSFetchRequest *allChefsRequest = [[NSFetchRequest alloc] init];
[allChefsRequest setEntity:chefEntity];

// Ask the context for everything matching the request.
// If an error occurs, the context will return nil and an error in *error.

chefs = [context executeFetchRequest:allChefsRequest error:error];

// Clean up and return.

[allChefsRequest release];

return chefs;
}