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

[Jack Lawrence]

This is better suited to the Apple developer forums/stack overflow, FYI.

> I selected "Class Definition" in the CodeGen pop up menu in the inspector.
This tells Xcode to automatically create and maintain the entity classes for you. They don't show up in the project navigator because they're autogenerated files, but they're available via autocomplete and command-click jump to definition.

> I then asked Xcode to generate the files with the "Create NSManagedObject subclasses".
Xcode has already generated NSManagedObject subclasses for you, so you've now created duplicate classes. That's why you're getting this:

> But everything breaks. Building the project, I now get several errors similar to this:
> 
> <unknown>:0: error: filename "PHAudioFile+CoreDataClass.swift" used twice: 

TL;DR: Don't create NSManagedObject subclasses manually—they're already created and automatically updated for you in Xcode 8.

> On Jan 15, 2017, at 10:01 PM, 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
> 
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> 
> has this line in error:
> 
> 
> 
> 
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> swift-users at swift.org
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