I've had about a day with this book. I'm an experienced developer with 3 published iOS Apps.
I had high expectation for this book, as the others I've read from this publisher are excellent. In my view this book is okay. Core Data is a bit of a hole in my Cocoa knowledge, but I don't think that this book is going to fill the hole in, unfortunately.
I was hoping for a good overview of sensible ways to structure the use of multiple managed object contexts. Why this would be done, when, where, and how. This does not seem to be covered. Multiple contexts can assist with threading, unrolling changes, and easily evicting managed objects from memory. I'd like guidance on that.
I was hoping to see how I might perform changes on a store _before_ performing a light weight migration. This does not seem to be covered, and it's not clear to me from the chapter on migrations if light weight and full migrations both use NSMappingModel, even though there are only mapping model _files_ in the latter case.
It's fairly widely suggested that the location for performing migrations suggested by Apple (which is in the app delegate) is not a good place to do them. This is not discussed in the book and it uses the default Apple approach.
Core data has some significant bits of best practice and gotchas that aren't in any way obvious, but need cataloguing. Without a catalogue, discovering them requires happening upon them in a blog, stack exchange comment, or scrap of documentation. I've not seen these brought up in a structured way in the book, or so far, in an unstructured way either.
The available documentation on Core Data is fairly conflicting, and a discussion of this would be valuable. This does not seem to be in the book.
I have so far learned that not all changes to a Managed Object Model require a migration, which is nice to know. I'm hoping for a bit more for my £20 though.
I think if you're after a guide in one place, this book is probably as good as any other single blob of advice on Core Data. However, it does not seem to bring all useful and relevant information together in a single body and neither does it offer a structure for navigating such a body of information.
If I revise my position, I'll try to update this review.
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他の国からのトップレビュー
Benjohn
Not the peerless guide I hoped for.
2015年6月2日に英国でレビュー済みAmazonで購入
Andrii Sosna
Nice book.
2013年5月11日にアメリカ合衆国でレビュー済みAmazonで購入
Henning
Gute Einführung in Core Data
2013年5月14日にドイツでレビュー済みAmazonで購入
Jeremie Weldin
solid and strightforward
2014年9月2日にアメリカ合衆国でレビュー済みAmazonで購入
gal516
Gut erklärt
2013年11月29日にドイツでレビュー済みAmazonで購入
