[swift-users] Core Data auto-generated Swift files errors?

[davelist at mac.com]

This would probably be better-suited on the Xcode list than here as I think it's a bug in Xcode.

I've had issues when trying out this new CoreData codegen feature. What fixes it for me is to go to:

~/Library/Developer/Xcode/DerivedData

and delete the entire directory for the build of my project that is there and then it re-generates everything correctly.

HTH,
Dave Reed


> On Jan 16, 2017, at 1:01 AM, Jean-Denis Muys via swift-users <swift-users at swift.org> wrote:
> 
> Hi,
> 
> Using Xcode 8.2.1 I just created a brand new document-based Cocoa application using Core Data and Swift. I created a single entity in the Document.xcdatamodeld file. I selected "Class Definition" in the CodeGen pop up menu in the inspector.
> 
> My entity is named PHAudioFile.
> 
> I then asked Xcode to generate the files with the "Create NSManagedObject subclasses". It generated two files:
> 
> - PHAudioFile+CoreDataClass.swift
> - PHAudioFile+CoreDataProperties.swift
> 
> But everything breaks. Building the project, I now get several errors similar to this:
> 
> <unknown>:0: error: filename "PHAudioFile+CoreDataClass.swift" used twice: '/Users/jdmuys/Phoenix/PHAudioFile+CoreDataClass.swift' and '/Users/jdmuys/Library/Developer/Xcode/DerivedData/Phoenix-buxfnwoppzieggdrogkoajdyimri/Build/Intermediates/Phoenix.build/Debug/Phoenix.build/DerivedSources/CoreDataGenerated/Document/PHAudioFile+CoreDataClass.swift'
> <unknown>:0: note: filenames are used to distinguish private declarations with the same name
> 
> More over, the Xcode editor shows many syntax errors in the generated files.
> 
> PHAudioFile+CoreDataClass.swift contains this:
> 
> import Foundation
> import CoreData
> 
> @objc(PHAudioFile)
> public class PHAudioFile: NSManagedObject {
> 
> }
> 
> With this error on the "public class PHAudioFile" line:
> 
> "Invalid redeclaration of PHAudioFile"
> 
> PHAudioFile+CoreDataProperties.swift starts with this line:
> 
> extension PHAudioFile {
> 
> Which breaks with:
> 
> "'PHAudioFile' is ambiguous for type lookup in this context"
> 
> and of course every line thereafter breaks too.
> 
> Searching for 'PHAudioFile' in my Xcode project, finds only those two files. In particular I can't find any other declaration for 'PHAudioFile'.
> 
> Am I missing something, or is this broken?
> 
> Thanks,
> 
> Jean-Denis