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POAm I Correctly Adding An Object To Core Data?
 

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    <p>I have an entity "Routine" with a to many relationship to "Exercise" called "routineExercises".</p> <p>I have a method called <code>addExercise</code> which should add an Exercise to an instance of Routine.</p> <p>Is this the correct way to implement this in code?</p> <pre><code>Exercise *exercise = (Exercise *)[NSEntityDescription insertNewObjectForEntityForName:@"Exercise" inManagedObjectContext:managedObjectContext]; exercise.name = selectedExercise; NSMutableSet *exercises = [[NSMutableSet alloc]init]; [exercises addObject:exercise]; Routine *routine = [NSEntityDescription insertNewObjectForEntityForName:@"Routine" inManagedObjectContext:managedObjectContext]; routine.routineExercises = exercises; </code></pre> <p>Update: I am getting an error at routine.routineExercises = exercises that says "-[Routine setRoutineExercises:]: unrecognized selector sent to instance 0x711bf30 2011-04-27 01:25:37.683 Curl[888:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Routine setRoutineExercises:]: unrecognized selector sent to instance 0x711bf30' "</p> <p>Update:</p> <pre><code>-(void)addExercise { if (managedObjectContext == nil) { managedObjectContext = [(CurlAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; [managedObjectContext retain]; } NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Exercise" inManagedObjectContext:managedObjectContext]; [request setEntity:entity]; NSError *error = nil; NSMutableArray *mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&amp;error] mutableCopy]; if (mutableFetchResults == nil) { // Handle the error. } Exercise *exercise = (Exercise *)[NSEntityDescription insertNewObjectForEntityForName:@"Exercise" inManagedObjectContext:managedObjectContext]; exercise.name = selectedExercise; NSMutableSet *exercises = [NSSet setWithObjects:exercise,nil]; Routine *routine = (Routine *)[NSEntityDescription insertNewObjectForEntityForName:@"Routine" inManagedObjectContext:managedObjectContext]; routine.routineExercises = exercises; if (![managedObjectContext save:&amp;error]) { // Handle the error. } NSLog(@"%@", error); [self.routineTableView reloadData]; [mutableFetchResults release]; [request release]; } </code></pre> <p><img src="https://i.stack.imgur.com/SJ8kL.png" alt="enter image description here"></p> <p>Error:</p> <pre><code>2011-04-27 03:05:58.902 Curl[1954:207] -[Routine setRoutineExercises:]: unrecognized selector sent to instance 0x5d4a4e0 2011-04-27 03:05:58.904 Curl[1954:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Routine setRoutineExercises:]: unrecognized selector sent to instance 0x5d4a4e0' </code></pre> <p>Routine.h</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #import &lt;CoreData/CoreData.h&gt; @class Exercise; @interface Routine : NSManagedObject { @private } @property (nonatomic, retain) NSString * name; @property (nonatomic, retain) NSDate * timeStamp; @property (nonatomic, retain) NSSet* routineExercises; @end </code></pre> <p>Routine.m</p> <pre><code>#import "Routine.h" #import "Exercise.h" @implementation Routine @dynamic name; @dynamic timeStamp; @dynamic routineExercises; - (void)addRoutineExercisesObject:(Exercise *)value { NSSet *changedObjects = [[NSSet alloc] initWithObjects:&amp;value count:1]; [self willChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; [[self primitiveValueForKey:@"routineExercises"] addObject:value]; [self didChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; [changedObjects release]; } - (void)removeRoutineExercisesObject:(Exercise *)value { NSSet *changedObjects = [[NSSet alloc] initWithObjects:&amp;value count:1]; [self willChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; [[self primitiveValueForKey:@"routineExercises"] removeObject:value]; [self didChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; [changedObjects release]; } - (void)addRoutineExercises:(NSSet *)value { [self willChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; [[self primitiveValueForKey:@"routineExercises"] unionSet:value]; [self didChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; } - (void)removeRoutineExercises:(NSSet *)value { [self willChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; [[self primitiveValueForKey:@"routineExercises"] minusSet:value]; [self didChangeValueForKey:@"routineExercises" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; } @end </code></pre>
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