Create an abstract base class for NSManagedObject

4
votes

I would like create an abstract base class for NSManagedObject which will use by all the entities of my project.

But, when I click on File > New > File NSManagedObject subclass, I can't create one if I don't link it white an entity from my Core Data model.

I would like to know how create an abstract base class for NSManagedObject

2
objective-ccore-dataabstract-classbase-class
What do you intend for this class to contain and why would it not have an associated entity? - Wain
I would add two virtual pure methods that all my Core Data's entities will implement. So I would like to create an abstract base class for NSManagedObject - Jean Lebrument

2 Answers

3
votes

Don't create a base class, instead, define an @protocol and have each of your managed object subclasses conform to that protocol. By doing this the compiler will verify that they have an implementation of all of the required methods from the protocol.

1
votes

Paul Goracke went into this in depth in a talk a couple of months ago. His blog post is at http://corporationunknown.com/blog/2014/02/16/core-data-potpourri/. Slides are at http://xcoders.s3.amazonaws.com/2014-02-13%20Core%20Data%20Potpourri.pdf, and a video of the talk is at http://vimeo.com/89370886.

I'm a long-time MOGenerator user and fan. Paul's approach to NSMO base class, though, provides almost all of the features that draw me to MOGenerator.