Core Data NSManagedObject downcast with XCode 7 and Swift - swift

Question

Running the following code aborts in the return line
Type is not Workout
Could not cast value of type
'NSManagedObject_Workout_' (0x7fcca20620f0) to
'AppName.Workout' (0x100ea5f40)).
The part inside if let... is never executed.
func createWorkoutWithName (name: String) -> Workout? {
let entityName = NSStringFromClass(Workout.classForCoder())
let newEntity = NSEntityDescription.insertNewObjectForEntityForName(entityName, inManagedObjectContext: managedObjectContext)
if let newEntity = newEntity as? Workout {
newEntity.name = name
}
NSLog("createWorkoutWithName: Type is not Workout")
return (newEntity as! Workout)
}
I had this problem in the past and I solved it in XCode 6.x by going in the entity inspector and setting Class = AppName.Workout
One of several answers that suggests this solution is
How come I can cast to NSManagedObject but not to my entity's type?
XCode 7 adds a new twist to this problem:
When I set
Class = AppName.Workout
in the entity inspector, XCode 7 changes the class name automagically to
Class = AppNameWorkout
by removing the dot between AppName and ClassName.
So how can I do this in XCode 7 when I can't set a dot between AppName and ClassName?

Answer 1

Go to your cdatamodel..where you declared your entity..There is a Default Configuration below the Entity. Check the Class column against your entity. By default this will have a dot prefixed. Remove the dot prefix .And it should work. And from what i see is you do not have to prefix your entity class name with the module name in Xcode 7. Hence you cannot use a dot in the class name.I am a newbie in iOS development. So i might not be totally right. But removing the dot prefix solved my issue in Xcode 7.

Answer 2

You need two fixes:
First: Set your entity class name as your entity name. For example:
Entity name = Entity
Class name = Entity
Second: add this code above your entity class file:
#obj(Entity name)
For example:
#obj(Entity)
Class Entity: NSManagedObject {
...
}

Answer 3

The combination of these solutions and the link you provided got me to the solution, but it took me a while to piece it all together. This is what I came up with (and it was basically just an oversight):
Click on .xcdatamodelId file in your file structure/project
navigator pane (far left).
Select the entity that you are having issues with.
In the Utilities pane (far right), look for the icon that looks like a 1997 cell phone, the Data Model Inspector.
Under the entity settings, you should see two fields, "Name" and "Class" - set up "Class" with the name of the class you are using (typically the same as "Name").
Thats where I messed up, even though all my other entities had this set, I had forgotten to set this on this particular entity. You'll even notice before you follow these steps that the default "class" is NSObject, reflecting the error message. Some of the other solutions here likely ultimately do the same thing, but I found this the simplest/quickest solution.
I should note that I already had some of the other items noted set, like the #objc(Entity) interoperability reference.