CoreData in Multiplatform App

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Created Aug ’20

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Hi I have an issue with Multiplatform app which use CoreData Hosted in CloudKit

Xcode 12 Beta 5 (12A8189h)

I don't change anything in the code and try to run it.

Build succeed

Run the app on macOs and get immediately this crash

Code Block 2020-08-22 09:08:36.342795+0200 Testing[27537:463165] [error] error:  Failed to load model named Testing
CoreData: error:  Failed to load model named Testing
2020-08-22 09:08:36.421964+0200 Testing[27537:463165] [error] error: No NSEntityDescriptions in any model claim the NSManagedObject subclass 'Item' so +entity is confused.  Have you loaded your NSManagedObjectModel yet ?
CoreData: error: No NSEntityDescriptions in any model claim the NSManagedObject subclass 'Item' so +entity is confused.  Have you loaded your NSManagedObjectModel yet ?
2020-08-22 09:08:36.422022+0200 Testing[27537:463165] [error] error: +[Item entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
CoreData: error: +[Item entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
Fatal error: UnsafeRawBufferPointer with negative count: file Swift/UnsafeRawBufferPointer.swift, line 872
2020-08-22 09:08:36.553889+0200 Testing[27537:463165] Fatal error: UnsafeRawBufferPointer with negative count: file Swift/UnsafeRawBufferPointer.swift, line 872

Run it on iOS iPhone 11 Pro and get imidiatly crash

Code Block 2020-08-22 09:09:55.269931+0200 Testing[27619:465943] [error] error:  Failed to load model named Testing
CoreData: error:  Failed to load model named Testing
2020-08-22 09:09:55.317706+0200 Testing[27619:466516] libMobileGestalt MobileGestaltCache.c:38: No persisted cache on this platform.
2020-08-22 09:09:55.334598+0200 Testing[27619:465943] [error] error: No NSEntityDescriptions in any model claim the NSManagedObject subclass 'Item' so +entity is confused.  Have you loaded your NSManagedObjectModel yet ?
CoreData: error: No NSEntityDescriptions in any model claim the NSManagedObject subclass 'Item' so +entity is confused.  Have you loaded your NSManagedObjectModel yet ?
2020-08-22 09:09:55.334797+0200 Testing[27619:465943] [error] error: +[Item entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
CoreData: error: +[Item entity] Failed to find a unique match for an NSEntityDescription to a managed object subclass
Fatal error: UnsafeRawBufferPointer with negative count: file Swift/UnsafeRawBufferPointer.swift, line 872
2020-08-22 09:09:55.370937+0200 Testing[27619:465943] Fatal error: UnsafeRawBufferPointer with negative count: file Swift/UnsafeRawBufferPointer.swift, line 872

In Xcdatamodelid there is nothing to pick from Class -> Module (in previous versions was Current Module as an option there)

Tried to clean derived data
Tried to clean project
Tried to change Item Class module from Global namespace to hardly written Current Module
Tried to change Codegen from ClassDefinition to Manual / None and create property my self

Answered by dan-allen in 628899022

Thanks @nigelfromtewkesbury that worked for me, too. Also led me to persistence.swift:34 where you can change the name of the data model it looks for:

Code Block swiftcontainer = NSPersistentCloudKitContainer(name: "YourContainerName")

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Answer 1

nigelfromtewkesbury OP

Aug ’20

This happened with me. The project was named (by me) DeleteSoon. When running, it was looking for model file DeleteSoon.xcdatamodeld, but the model file created by Xcode was name Shared.xcdatamodeld. Changed the name from Shared to DeleteSoon and it now runs ok.

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Answer 2

dan-allen OP

Aug ’20

Accepted Answer

Thanks @nigelfromtewkesbury that worked for me, too. Also led me to persistence.swift:34 where you can change the name of the data model it looks for:

Code Block swiftcontainer = NSPersistentCloudKitContainer(name: "YourContainerName")

4