May 2008
Intermediate to advanced
464 pages
8h 13m
English
Content preview from Cocoa Programming for Mac OS X, Third Edition
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Chapter 30. Core Data Relationships
It is time to delve a bit deeper into Core Data. In Chapter 11, you dealt with a single entity (Car). In most applications, you will have multiple entities and relationships between them. Core Data supports to-one relationships and unordered to-many relationships.
This exercise will have two entities: Employee and Department. An employee will work for one department. A department will have a set of employees. A department will also have one employee (chosen from its set) who will be a manager. Thus, there are three relationships, as shown in Figure 30.1.
Figure 30.1. The Data Model
Edit the Model
In this section, ...
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