Xcode 8 beta 4 - Crash when code generating CoreData objects

Question

Created Aug ’16

Replies 8

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Just wanted to check if anyone else is hitting a crash that appears to be related to code generation for core data model objects. This crash happen everytime I open my project using Xcode 8b4. It has been working just fine in prior Xcode 8 betas.

MainQueue: __103-[IDEDataModelCodeGenerator generateCodeForInputFile:outputFilePath:completionQueue:completionHandler:]_block_invoke.60
ProductBuildVersion: 8S188o
ASSERTION FAILURE in /Library/Caches/com.apple.xbs/Sources/IDEPlugins/IDEPlugins-11209.5/IDECoreDataModeler/ModelFoundation/CDMModelClasses/CDMRelationshipCodeGeneration.m:90
Details:  code which should be unreachable has been reached
Object:   <CDMRelationship: 0x7fcfc8658380>
Method:   -code_accessorsSwift

I have cleared caches and prior build output to see if some stale data existed, it is still happening.

I will attempt to work around it but wonder if anyone else has already figured out a work around. (will attempt to file a defect shortly)

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Answer 1

shawnce OP

Aug ’16

If manually edit the xcdatamodel to disable "category" code generation the project can be opened and worked with. If I enable "category" code generation on any random model entity and save the xcdatamodel Xcode crashes immediately.

This of course defeats the purpose of code generation at the moment.

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Answer 2

Scenario OP

Aug ’16

This just fills me with confidence, seeing how useless codegen has been so far.

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Answer 3

fivewood OP

Aug ’16

Thanks! I had the same problem and eliminated the crashes by switching to Manual (no code generation), after copying the previously generated extensions to my bundle.

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Answer 4

miksar OP

Aug ’16

In my case crashes seem to be caused by to-one relationships.

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Answer 5

Megalith OP

Aug ’16

Anybody hear of a good work-around?

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Answer 6

shawnce OP

Aug ’16

Yeah I just got a chance to confirm that. to-one relationships seems to be the trigger for the assert... kinda prevent prevents it from being useful since my model is riddled with to-one relationships.

Now if I can find a way to restore/download Xcode 8 beta 3 I could make progress on my prototype.

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Answer 7

carpenter OP

Aug ’16

I'm getting the error as well but it seems to be a to-many relationship for me. For a while I thought it was caused by two entities having to-many relations to the same third entity. I can build if the relation is to-one, but when I try to change it so it's a to-many relation it crashes on the build. I *thought* that's what it was, but then I started over with a small sample with just three entities and the converging to-many relations and it didn't crash 😟

I'll try generating the code and changing it after switching the generator off.

Mike

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Answer 8

carpenter OP

Aug ’16

Mine has gone away after installing Beta 5

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