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iosswiftcore-dataswift3ios-frameworks
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Reputation: 5061

Swift 3 Core Data NSInternalInconsistencyException entityForName could not locate an entity named Foo in this model

I have a framework project and getting that strange error when I try to unit test my classes. here is code suggested by Andrew Bancroft to get in memoryNSManagedObjectContext 

func setUpInMemoryManagedObjectContext() -> NSManagedObjectContext {
    let managedObjectModel = NSManagedObjectModel.mergedModel(from: [Bundle.main])!
    let persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel)

    do {
        try persistentStoreCoordinator.addPersistentStore(ofType: NSInMemoryStoreType, configurationName: nil, at: nil, options: nil)
    } catch {
        print("Adding in-memory persistent store failed")
    }

    let managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
    managedObjectContext.persistentStoreCoordinator = persistentStoreCoordinator

    return managedObjectContext
}

But whenever I try to insert an object (or any other db operation) by this code

 let newLocationMO = NSEntityDescription.insertNewObject(forEntityName: table, into: context) as! LocationMO

It crashes with error mentioned in title.

I also tried to test with real context, so I import my framework to a temporary project and get context from AppDelegate auto-generated code but it crashes with same error as if it doesn't see my .xcdatamodeld definition.

Note: I checked all typos and that no file is missing.

Maybe it is not allowed to have Core Data in framework project ? Any links or example of core data usage in framework project is highly appreciated.

Upvotes: 0

Views: 325

Answers (1)

Tom Harrington
Tom Harrington

Reputation: 70936

You can use Core Data in a framework but you need to make sure that your code knows that it's in a framework. The most likely source of trouble is this line:

let managedObjectModel = NSManagedObjectModel.mergedModel(from: [Bundle.main])!

If you're in a framework, your model is not in the main bundle. You're telling it to look in the wrong place, so it's not finding the model file.

You probably want to change that to Bundle(for: type(of:self)) so that you'll be looking in the same bundle that contains the framework classes.

Upvotes: 1

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