Initializing an NSManagedObject subclass

I've been programming with Obj-C for a few months now, but I'm new to this whole Core Data thing. Now so far, most of my model objects have required that I override the (id)init method, so as to properly initialize the object. Now so far in the tutorials, the book I've been working through, and examples online, I've only seen one person override the (id)init method in a subclass of NSManagedObject. In this example, instead of calling

Code:

[super init]

they called

Code:

[self initWithEntity: tEntityDescription insertIntoManagedObjectContext: theMOC];

Is this a required step in overriding the (id)init with a NSManagedObject subclass, or would I still be good with the way I've done with non-core data objects?

 

Sorry, I'm kind of lost with what you're saying here. My understanding is that the NSManagedObjectContext looks over the objects, so why/how would I share it, and what exactly would I be sharing it with?