Creating Model URL for Core Data

Question

I want to using core data to save and load my data that I get from server:

 private lazy var managedObjectModel : NSManagedObjectModel = {
    let modelURL = NSBundle.mainBundle().URLForResource(self.manageObjectModelName, withExtension:"mom")!
    return NSManagedObjectModel(contentsOfURL: modelURL)!
}()

I have an error

unexpectedly found nil

while unwrapping an Optional value in this code. And my persistanceStoreCooardinator storage and mainQueueContext storage are nil. How can solve this problem?

Answer 1

Typo in this line mom instead of momd:

let modelURL = NSBundle.mainBundle().URLForResource(self.manageObjectModelName, withExtension:"momd")!