Monthly Archives: October 2011

 
14
Oct
2011
 

Parent Watching Its Child

by Marcus Zarra

Recently on [StackOverflow](http://stackoverflow.com) I have seen several questions regarding the desire for a parent Entity to be updated whenever an attribute within the child has changed.

There are several different ways to solve this problem. The easiest is to have the child ping the parent whenever it changes and then the parent can update any values it needs to as a result of that ping.
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11
Oct
2011
 

Core Data and the Undo Manager

by Marcus Zarra

*Note: This is a re-print from the Mac Developer Network.*

One of the nice things about developing software for OS X is all the “freebies” we get out of Cocoa. For example, when we are building a UI with text input we get undo support for free! How cool is that?

Likewise, when we are working with Core Data, it also has undo support built right in. Every NSManagedObjectContext has a NSUndoManager that we can use. However there are some situations where the default undo support is insufficient.

In this article we are going to walk through one such situation.
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