Join Simon Allardice for an in-depth discussion in this video Exploring lightweight migration, part of Core Data for iOS and OS X.
When you have a data model that's in active use, meaning that you're creating and saving…data based on that data model, and you can't get rid of that data, but you need to make…a change to the model,…we do that by creating a new version of that data model, not just by changing the old one…and hoping for the best.…We need the old version to still exist so that we can describe to Core Data how it should…convert the old data across to the new format.…So let's say we go back to this idea of wanting to add a new attribute to an existing entity.…
Well, rather than just add it in here to my Attributes list, what I'm going to do--with…the datamodel file selected and open-- I'll go up to the Editor, and we have an option…here to Add a Model Version.…So in here it's asking me, what do we want to call it?…Version name, CDCourses 2, Based on the original model, CDCourses.…That's fine, the numbering system is actually whatever is meaningful to you because Core…Data will use its own internal numbering system based on some hashes inside, but this will do.…
- Understanding Core Data and object persistence frameworks
- Creating a Core Data project
- Exploring data modeling
- Creating entities, attributes, and relationships
- Creating managed objects
- Fetching in Core Data
- Implementing undo and redo support
- Creating a Core Data Cocoa app without code
- Responding to validation issues
- Converting store types
- Preloading default data
Skill Level Intermediate
Q: In the CoursesViewController.m file, I receive a message that the method dismissModalViewControllerAnimated is no longer supported by Apple. Is there a newer method to use?
A: You may have received the warning that a call to the dismissModalViewControllerAnimated: method is now deprecated.
This is a recently deprecated method, so the code _will_ continue to work using that call, but to remove the warning, change the code from:
to the current recommended version:
[self dismissViewControllerAnimated:YES completion:nil];
It should take care of that message.
1. Getting Started
2. Modeling in Core Data
3. Saving in Core Data
Creating managed objects12m 46s
4. Fetching in Core Data
Using predicates9m 32s
5. Putting It Together: iOS
6. Putting It Together: Cocoa
7. Store Types and Model Changes
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