StackOverflow2013

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copied!<p>I have the following code:</p> <pre><code> @interface Reservation : RKObject { NSNumber * _uid; NSNumber * _did; NSNumber * _rid; NSString* _origin; NSString* _destination; NSString* _time_range; NSDate * _start_date; NSDate * _end_date; } @property (nonatomic, retain) NSDate * start_date; @property (nonatomic, retain) NSDate * end_date; @property (nonatomic, retain) NSNumber * uid; @property (nonatomic, retain) NSNumber * did; @property (nonatomic, retain) NSNumber * rid; @property (nonatomic, retain) NSString * time_range; @property (nonatomic, retain) NSString * origin; @property (nonatomic, retain) NSString * destination; @end #import "Reservation.h" @implementation Reservation @synthesize time_range= _time_range; @synthesize origin=_origin; @synthesize destination=_destination; @synthesize uid=_uid; @synthesize did=_did; @synthesize rid=_rid; @synthesize start_date=_start_date; @synthesize end_date=_end_date; + (NSDictionary*) elementToPropertyMappings { return [NSDictionary dictionaryWithKeysAndObjects: @"TIME_RANGE", @"time_range", @"ORIGIN_ADDRESS", @"origin", @"DESTINATION_ADDRESS", @"destination", @"UID", @"uid", @"DID", @"did", @"RID", @"rid", @"START_DATETIME", @"start_date", @"END_DATETIME", @"end_date", nil]; } /* + (NSDictionary*)elementToRelationshipMappings { return [NSDictionary dictionaryWithKeysAndObjects: @"NSDate", @"start_date", @"NSDate", @"end_date", nil]; } */ - (void)dealloc { [_start_date release]; [_end_date release]; [_uid release]; [_did release]; [_rid release]; [_origin release]; [_destination release]; [_time_range release]; //[_deal release]; //[_route release]; [super dealloc]; } </code></pre> <p>@end</p> <pre><code>@interface ReservationViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, RKObjectLoaderDelegate>{ Reservation * myres; } @property (nonatomic, retain) Reservation * myres; #import "ReservationViewController.h" @implementation ReservationViewController @synthesize myres; - (IBAction)makeReservation:(id)sender { self.myres = [[[Reservation alloc] init] autorelease]; myres.start_date = [df dateFromString:[NSString stringWithFormat:@"%@ %@", [self.data objectForKey:@"date"], [self.data objectForKey:@"start_time"]]]; myres.end_date = [df dateFromString:[NSString stringWithFormat:@"%@ %@", [self.data objectForKey:@"date"], [self.data objectForKey:@"end_time"]]]; NSLog(@"date is %@", myres.start_date); } - (void)objectLoader: (RKObjectLoader*) objectLoader didLoadObjects:(NSArray *)objects { Interval * res_int = [[Interval alloc] init]; res_int.date1 = myres.start_date; //why is it null here res_int.date2 = myres.end_date; //why is it null here res_int.rid = [[objects objectAtIndex:0] rid]; [[LocationDictionary sharedLocationDictionary] addLocationtoDictionary:[self.data objectForKey:@"route"] withKey:res_int]; </code></pre> <p>}</p> <p>The question is why is <code>res_int.date1</code> null when I tried printing it out? When I print myres.start_date inside the method makeReservation, it prints appropriately Can someone explain this to me and how to fix it?</p> <p><strong>UPDATE:</strong></p> <p>I have done the following at my setter:</p> <pre><code>-(void) setStart_date:(NSDate *) boo { NSAssert(boo != nil, @"why is this nil"); _start_date = boo; } </code></pre> <p>at the end the stack trace I got is:</p> <pre><code> *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'why is this nil' *** Call stack at first throw: ( 0 CoreFoundation 0x019ac5a9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x01b00313 objc_exception_throw + 44 2 CoreFoundation 0x01964ef8 +[NSException raise:format:arguments:] + 136 3 Foundation 0x014013bb -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116 4 Project 0x00012d42 -[Reservation setStart_date:] + 194 5 Foundation 0x0137e5e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285 6 Project 0x0004c7b3 -[RKObjectMapper updateModel:ifNewPropertyValue:forPropertyNamed:] + 172 7 Project 0x0004cd55 -[RKObjectMapper setPropertiesOfModel:fromElements:] + 754 8 Project 0x0004d8f3 -[RKObjectMapper updateModel:fromElements:] + 50 9 Project 0x0004bb7a -[RKObjectMapper mapObject:fromDictionary:] + 201 10 Project 0x0004ba42 -[RKObjectMapper mapObject:fromString:] + 148 11 Project 0x0004927b -[RKObjectLoader processLoadModelsInBackground:] + 537 12 Foundation 0x01370cf4 -[NSThread main] + 81 13 Foundation 0x01370c80 __NSThread__main__ + 1387 14 libSystem.B.dylib 0x931a085d _pthread_start + 345 15 libSystem.B.dylib 0x931a06e2 thread_start + 34 ) terminate called after throwing an instance of 'NSException' </code></pre>

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