I am following new tutorials and reached Day 58, i followed everything according to the tutorial for many-to-one relation of candy and country, but for some reason i am getting all the candies in different sections even for the same country origin. https://github.com/answami99/imagesProject12/blob/main/Pasted%20Graphic%2011.png i tried copying the same exact code and its still same. You can check the code here: https://github.com/answami99/imagesProject12/tree/main/CoreDataDuplicate Also i tried running project12 from the files i downloaded from https://github.com/twostraws/HackingWithSwift, and its output is also same.

You might want to check that you have set up the DataModel.xcdatamodel correctly the problem may lay there.

Aditya asks:

if i do with or without moc.save() should i expect different outputs.

@twostraws suggested you comment out the moc.save() code to save you time while testing.
Otherwise, you'd have to create a few test records and save. Then quit and restart to verify the records were saved. Then you test the delete code. Again, you would quit and restart to verify the records were deleted.

If you changed font size, or color, or padding, or any other minor changes, you'd grow tired of having to repeat the create / delete records steps. His suggestion was for your testing convenience.

It seems that upgrading to XCode 13.1 solved your other issue! Nice.