Have you tried to use Core Data in RubyMotion, only to get lost in the quagmire of simplistic or confusing examples, DSL's and gems?
Well, Core Data in Motion has got you covered. I went out and shaved that herd of yaks so you don't have to. And now I'll be serving it up in nice uniformly stuffed pillow-shaped pieces, I mean lectures.
Core Data in Motion is an online course, tackling each of these problems head on, one section at a time, with a brief historical review of "the XCode/Objective-C way", and then providing a detailed, code-oriented solution using RubyMotion and the iOS SDK.
After we've achieved that base-level understanding of how Core Data actually works, we'll review the available RubyMotion gems which may provide even simpler solutions, but you'll now be able to understand exactly which problems those gems solve for you, which problems they do not, and be confident that you've chosen the best option to solve your specific problems.
Core Data is hairy because it solves real problems - http://sealedabstract.com/code/you-should-use-core-data/.
If you are using RubyMotion to solve real problems, with a real data model, and complex data relationships, you need Core Data, and you need this course.
Lori is a Ruby, Rails, and RubyMotion developer of many years experience. She has written an iPhone app (WIMBY - http://wimby.ca) in RubyMotion, a book based on her experiences with Core Data while creating WIMBY (Core Data in Motion - http://coredatainmotion.com), and has spoken at RubyMotion #inspect. She has also taught well-received Rails4iOS Developers, and RubyMotion for Rails Developers workshops at conferences around the world.