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      Latest reply on Mar 12, 2020 8:46 AM by nutsmuggler
      nutsmuggler Level 1 Level 1 (0 points)


        I have an issue in an app which is yet unreleased.

        The app uses Core Data, and I recently added CloudKit integration.

        Whenever I start the app data get automatically downloaded by CloudKit and I get this log:


        <NSCloudKitMirroringDelegate: 0x600001da61b0> - Never successfully initialized and cannot execute request '<NSCloudKitMirroringImportRequest: 0x6000024c88a0> D3FB21AB-94ED-40B7-859B-6CBEE6149473' due to error: Error Domain=NSCocoaErrorDomain Code=134404 "(null)" UserInfo={NSDetailedErrors=(

            "Error Domain=NSCocoaErrorDomain Code=133021 \"(null)\" UserInfo={NSExceptionOmitCallstacks=true, conflictList=(\n    \"NSConstraintConflict (0x600003f40e00) for constraint (\\n    name\\n): database: 0x8143748c0004e8e1 <x-coredata://272191BB-7D10-41DD-8E4B-56F4ECE4AB9F/Ingredient/p195>, conflictedObjects: (\\n    \\\"0x8143748c181ce8e1 <x-coredata://272191BB-7D10-41DD-8E4B-56F4ECE4AB9F/Ingredient/p1733>\\\"\\n)\",\n    \"NSConstraintConflict (0x600003f42fc0) for constraint (\\n    name\\n): database: 0x8143748c029ce8e1 <x-coredata://272191BB-7D10-41DD-8E4B-56F4ECE4AB9F/Ingredient/p101>, conflictedObjects:


        This is just the initial part of the log; the above line is repeated many times, with different IDs of course.


        To give you some context, the app has a list of Ingredients, which is seeded the first time the app is launched. I have a seed version constant, which is compared to a "seedversion" parameter, persisted to core data (and consequently cloudkit).

        Ingredients has a constraint on the "name" property, which is a string.


        I guess, for some reason, the seed was launched multiple times, and ingredients got duplicated; in plainer terms,I might have multiple instances of "cheese", deriving from different seeds.

        I already have set the conflict merge policy in the NSPersistentCloudKitContainer initialization:


                container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy


        Yet I still get the error.

        I looked at th docs and google for some suggestions, but I haven't found anything useful.

        Any suggestion?