### Core Data Utility ###

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DESCRIPTION:

This sample contains the complete source code to the Core Data Utility Tutorial.

The sample illustrates how you can create a command-line utility that uses Core Data. It shows how to performs basic tasks required in a Core Data application:

* Creation of a Core Data stack -- a persistent store, a persistent store coordinator (including the managed object model), and a managed object context.

* Creation and initialization of a managed object.

* Committing changes to the store by saving a context.

* Creating a fetch request and retrieving managed objects.

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PACKAGING LIST:

Run.{h,m}

Run is a simple managed object class to record the date and process ID of a process. It also implements:

* awakeFromInsert: to set the date of a Run instance to the date at which it is first inserted into a managed object context.

* setNilValueForKey: to trap an attempt to set a nil value for the process ID (which is a scalar value).

main.m

Contains the main() function to run the utility, and additional supporting functions.

There are supporting functions to:

* Create the managed object model.

* Create the managed object context and the rest of the Core Data stack.

* Create a URL to the application's log directory.

Using the supporting functions, the main function creates a new instance of the Run entity to represent the current run of the utility, adds the run to the persistent store, and lists previous runs.

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CHANGES FROM PREVIOUS VERSIONS:

Version 1.0

- First version.

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Copyright (C) 2012 Apple Inc. All rights reserved.