June 2016
Intermediate to advanced
214 pages
5h 40m
English
Content preview from Core Data in SwiftBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Some Maintenance Before We Migrate
Before we actually release a new version of our application that migrates the data, we need to first complete a minor “maintenance” update for our users. Normally, we’d add this code to the very first version of our application, but just in case we wrote that first release before versioning was a consideration, we need to go back to our old version and add a small amount of code to help our users.
Some users will download the new version of an application to just “try it out” and see if it’s worth the upgrade price and the hassle. Normally this isn’t an issue—until we upgrade the data underneath our users. Then things go sideways. What we do not want to happen is the error message shown here.
Note that this ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.