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The NSManagedObjectContext manages NSManagedObject instances NSManagedObjects are not entities, but rather, created from entities An application obtains data from the persistent store and uses the entities in the model to create the NSManagedObjects placed in the context Consider NSEntityDescriptions as the classes and NSManagedObjects as the objects The previous Try This task created entities in the xcdatamodel file Although the NSManagedObjectModel uses these entities, the NSManagedObjectContext does not; it manages NSManagedObjects Our AKCGroup and Breed classes are therefore subclasses of NSManagedObject

The two new initializers, initWithPressure: and initWithTreadDepth:, are for folks who know they want a tire with either a particular pressure or a particular tread depth but don t care about the value of the other attribute and are happy to accept the default. Here s a first attempt at an initialization (which we ll be fixing later):

As a navigation-based application, the DogBreeds application will use a hierarchy of UITableViews to display our AKC groups and breeds Displaying objects from Core Data in UITableViews is such a common task that iOS provides support for easily connecting fetched results to a table view The NSFetchedResultsController object and NSFetchedResultsControllerDelegate protocol make it relatively easy to retrieve a set of objects from Core Data and modify the set as the user adds, deletes, and updates them via a table view

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Quantitative Business Valuation, ibid, 85, equation (3-23) 1 1 (1 r)n 2 The formula is ADF , where r is the discount rate and n is r the number of time periods (usually months in a business loan) from the valuation date The only difference between the nominal and the real ADF is that in the former, we use the nominal interest rate of the loan, which is fixed for the entire life of the loan, while in the latter, we use the current market rate that a bank would charge on this loan, which varies almost constantly

The NSFetchRequest class is how you query a persistent object store for its data It uses an NSEntityDescription to know which entity to fetch Listing 17-3 illustrates creation of an NSFetchRequest and an NSEntityDescription, and assigns the description to the request The NSManagedObjectContext then executes the request and returns the matching objects in an NSArray

- (id) initWithPressure: (float) p { if (self = [super init]) { pressure = p; treadDepth = 20.0; } return (self); } // initWithPressure

Listing 17-3

- (id) initWithTreadDepth: (float) td { if (self = [super init]) { pressure = 34.0; treadDepth = td;

A 1 2 3 4

NSFetchRequest * myRequest = [[NSFetchRequest alloc] init]; NSEntityDescription * entDesc = [NSEntityDescription entityForName:@"AKCGroup" inManagedObjectContext:myContext]; [myRequest setEntity:entDesc]; NSError * error; NSArray * fetchResults = [selfmanagedObjectContext executeFetchRequest:myRequest error:&error]; if(fetchResults == nil) { NSLog(@"an error occurred"); [error release]; }

We now have four init methods: init, initWithPressure:, initWithTreadDepth:, and initWithPressure:treadDepth:. Each of these knows the default pressure (34), the tread depth (20), or both. That works out OK, and the code is correct. The problems come when we start subclassing Tire.

Notice Listing 17-3 selects all the AKCGroups in myContext Unless you know there will always be a reasonable number of results, you will want to limit the results returned One way you could do this is through the NSFetchRequest s fetchLimit property This property limits the objects returned by a fetch request However, this property does not distinguish which objects to exclude Often, you will want to limit results to only objects meeting certain criteria For instance, you might want all Breeds in a particular AKCGroup The way you limit results based upon given criteria is through the NSPredicate class

r 6 i r/12 7 Yrs 8 n Yrs *12 9 ADF @14%, 84 Mos 10 Discount on Total Prin 11 % Financed 12 Discount on % Financed

The NSPredicate class restricts the data returned by an NSFetchRequest It is similar to a SQL statement s WHERE clause The easiest way to create a predicate is by using the predicateWithFormat class method

We already have a subclass of Tire named AllWeatherRadial. Now, suppose that AllWeatherRadial wants to add two new instance variables, rainHandling and snowHandling, which are floating point values that indicate how the tire handles on wet and on snowy roads. We need to make sure these get set to reasonable values when a new AllWeatherRadial is made. So, here is the new interface for AllWeatherRadial, with the new instance variables and accessors:

+ (NSPredicate *)predicateWithFormat:(NSString *)format,

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