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12-May-2020 09:07

Because hashes are truncated to a specific size, it is technically possible for two pieces of very different content to generate the same hash, known as a "collision", but this is extremely rare. Please go ahead and run your app a few times to make sure there are a good number of duplicates so you can see the problem in action.We added some Select the data model (Project38.xcdatamodeld) and make sure the Commit entity is selected rather than one of its attributes.The reason this is required is because you just made an important change to your model, which is generally a bad idea unless you know what you're doing.Before you run your project again, I want you to make one tiny code change.Its intended use case is the import of external data that should be merged with existing objects in the database.Until now, when you wanted to import data objects into Core Data from a file or network request, you had to create a fetch request for each incoming object with a predicate that matches the id and then execute it to look for an existing version of that object.

This new feature was briefly demonstrated at WWDC in June (Session 220).Core Data will automatically check if there is an existing object with the same unique attribute and … At least that’s the default behavior, which caused some confusion.



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