CODEWITHSUNDEEP
xcodecore-dataxcode8
Adam Carter
Adam Carter

Reputation: 4844

Core Data code generation causes build failure

I’m using the new Xcode 8 feature of code generation for my Core Data model using Class Definition as the Codegen option.

When I build I get the following output for each of my entities:

<unknown>:0: error: no such file or directory: ‘/path/to/DerivedSources/CoreDataGenerated/Model/.Entity+CoreDataClass.swift'
<unknown>:0: error: no such file or directory: ‘/path/to/DerivedSources/CoreDataGenerated/Model/.Entity+CoreDataProperties.swift’
...
Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 1

On inspecting the files I can see the following:

Entity+CoreDataClass.swift:

import Foundation
import CoreData


public class Entity: NSManagedObject {

}

Entity+CoreDataProperties.swift

import Foundation
import CoreData
import 

extension Entity {

    @nonobjc public class func fetchRequest() -> NSFetchRequest<Entity> {
        return NSFetchRequest<Entity>(entityName: “Entity");
    }

    @NSManaged public var title: String?

}

In the second, the obvious thing that shouldn’t be there is the empty import statement, which I’m guessing is causing the crash.

Could I be doing something wrong? Is this a bug?

I’ve tried all the usual, clean, clean build folder, restart Xcode/Mac with no luck.

Upvotes: 3

Views: 1990

Answers (2)

Elise van Looij
Elise van Looij

Reputation: 4232

Core Data is heavily string-based. Using names such as "Entity" for your entities can lead to unexpected results. Also avoid using names in your data model such as "description", or "item" or "attribute" etc. If you do want to use those names, prefix them: names like "My_entity" or "ACEntity" are fine.

Upvotes: 0

Adam Carter
Adam Carter

Reputation: 4844

The Module field of the entity in the Data Model inspector had a value in it, I deleted this so now it’s empty and the placeholder reads “Global namespace”. This seems to have worked!

Upvotes: 2

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