A great article on a subject.
http://useyourloaf.com/blog/core-data-code-generation/
On Tue, Jan 17, 2017 at 2:21 AM, Jack Lawrence via swift-users <
swift-users@swift.org> wrote:
> 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@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
>
>
>
>
>
>
>
>
>
>
>
>
> has this line in error:
>
>
>
>
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