Bizarre CoreData error when moving to data model to swift package

When moving my working Core Data model to a swift package, the package/app combo build but the app crashes on launch. The debugger points to the @main attribute on my App struct (using SwiftUI) and prints the following messages in the console:

"CoreData: error:  Failed to load model named StationData

Swift/UnsafeRawBufferPointer.swift:879: Fatal error: UnsafeRawBufferPointer with negative count

2022-03-09 20:46:29.156232-0600 Swift/UnsafeRawBufferPointer.swift:879: Fatal error: UnsafeRawBufferPointer with negative count"

I'm unsure as to what exactly is occurring here, especially since the model built and ran perfectly fine when it was a part of the app instead of the package.

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thafner
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Changing the module to the swift package instead of the current project module worked for me.

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thafner
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It looks like your trying to load the model from the main bundle. You need to load it from the Swift package bundle and then pass it to the NSPersistentContainer initializer.

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kharrison
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  • When using the managedObjectModel merged from the module's bundle, it says that it's confused because it says that no model has defined an entity relating to a particular subclass of NSManagedObject.

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    thafner

  • I have the same issue as @thafner—The fix "works", but comes with the new error they mention...

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    rubencodes
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Changing the module to the swift package instead of the current project module worked for me.

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thafner
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