Core Data: Could not cast value of type 'MyType_MyType_2' to MyType
Solution 1
When I had this issue, it was because I had forgotten to set the "class" on the entity. This is what I came up with:
- 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").
You'll even notice before you follow these steps that the default "class" is NSObject, reflecting the error message. I found some programatic ways to do this too, but this seemed like the simplest/quickest solution.
I should note that my model WAS written in Swift, so I did have to add the @objc(Entity) interoperability reference mentioned by @zellb. But that shouldn't make a difference in the solution as long as you are doing that part properly (and that would cause a different unrelated error from my understanding).
Solution 2
- Set Entity Class Name
- Set Module "Current Product Module" like below
Solution 3
just try this:
@objc(MyType)
public class MyType: NSManagedObject {
// your class
}
instead of this:
class MyType: NSManagedObject {
// your class
}
Bastian
Updated on June 17, 2022Comments
-
Bastian almost 2 years
I have an Objective-C model class MyType. This class is used in Swift code:
NSEntityDescription.insertNewObjectForEntityForName("MyType", inManagedObjectContext: context) as! MyType
The
as!
cast results in the error messageCore Data: Could not cast value of type 'MyType_MyType_2' (0x7be99a30) to MyType (0xf33db74).
If I cast it as
NSManagedObject
it works. When I print the result, I can nevertheless see, that it is an actual instance of MyType:<MyType: 0x7ae06d50> (entity: MyType; id: 0x7aeba6d0 <x-coredata:///MyType/t957F2860-85F8-46E0-B6D6-4D1DF6C4EC613> ; data: { ...the fields... })
What is happening here? And where does the name
MyType_MyType_2
come from? -
Vito Royeca about 8 yearsIt looks like a Tomagotchi icon though, for the Data Model Inspector.
-
Murray Sagal over 7 yearsI started my Swift project in xCode 7 and entities I created there had
Module
specified as shown above. Now in xCode 8 (8A218a)Module
is empty after creating a new entity. Specifying as above fixed it for me. -
Christian Di Lorenzo about 6 yearsUnfortunately, this causes stackoverflow.com/q/39931137/2740693 when I'm using Objective-C CoreData. Any insights?
-
Dasoga over 5 yearsI had to put the class name as well and just adding: press cmd + k (clean) and build cmd + b again. Run your project. It worked for me. thanks!