Memory leaks in NSMutableDictionary - iphone

Question

My coding contains a memory leak, and somehow I can't find the leak.
Leaks points me in the direction of the way I create "ReportDetailItems"
e.g. areaContainer = [[[ReportDetailItem alloc] init] autorelease];
I've been looking at this for hours and I am at a total loss, the objects reported leaking are "ReportDetailItem", and the NSMutableDictionary contained in those objects.
Please advice.
------[ReportDetailItem.h
#interface ReportDetailItem : NSObject
{
NSNumber *total;
NSMutableDictionary *items;
}
#property (nonatomic, retain) NSNumber *total;
#property (nonatomic, retain) NSMutableDictionary *items;
- (NSString *)description;
#end
------[ReportDetailItem.m
#synthesize items, total;
- (id)init {
if (self = [super init]) {
self.items = [NSMutableDictionary dictionaryWithCapacity:0];
DLog("Alloc: %d", [items retainCount]);
}
return self;
}
- (NSString *)description {
return #"ReportDetailItem";
}
- (void)release {
[super release];
}
- (void)dealloc {
[self.items release];
[self.total release];
items = nil;
total = nil;
[super dealloc];
}
#end
------[Leaking code
NSError *error;
NSArray *data = [self.managedObjectContext executeFetchRequest:request error:&error];
if (data == nil || [data count] == 0) {
DLog(#"No data.")
} else {
for (int i=0; i < [data count]; i++) {
TaskEntity *task = [data objectAtIndex:i];
NSString *areaKey = task.activity.project.area.title.text;
NSString *projectKey = task.activity.project.title.text;
NSString *activityKey = task.activity.title.text;
ReportDetailItem *areaContainer;
if (![dataSource objectForKey:areaKey]) {
areaContainer = [[[ReportDetailItem alloc] init] autorelease];
} else {
areaContainer = [dataSource objectForKey:areaKey];
}
areaContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [areaContainer.total intValue])];
[dataSource setObject:areaContainer forKey:areaKey];
ReportDetailItem *projectContainer;
if (![areaContainer.items objectForKey:projectKey]) {
projectContainer = [[[ReportDetailItem alloc] init] autorelease];
} else {
projectContainer = [areaContainer.items objectForKey:projectKey];
}
projectContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [projectContainer.total intValue])];
[areaContainer.items setObject:projectContainer forKey:projectKey];
ReportDetailItem *activityContainer;
if (![projectContainer.items objectForKey:activityKey]) {
activityContainer = [[[ReportDetailItem alloc] init] autorelease];
} else {
activityContainer = [projectContainer.items objectForKey:activityKey];
}
activityContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [activityContainer.total intValue])];
[projectContainer.items setObject:activityContainer forKey:activityKey];
}
}

Answer 1

I found it, the leak was located in the way I allocated the "dataSource"
---[Leak
- (void)viewDidLoad {
[super viewDidLoad];
self.dataSource = [[NSMutableDictionary alloc] init];
[self fetchData];
}
---[No leak
- (void)viewDidLoad {
[super viewDidLoad];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
self.dataSource = dict;
[dict release];
[self fetchData];
}

Answer 2

I'm pretty skeptic about the two ways u assign pointers to the ReportDetailItem. Why are you trying to autorelease the object in the first place? If not try this
ReportDetailItem *projectContainer;
if (![areaContainer.items objectForKey:projectKey]) {
projectContainer = [[ReportDetailItem alloc] init];
} else {
projectContainer = [[areaContainer.items objectForKey:projectKey] retain];
}
projectContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [projectContainer.total intValue])];
[areaContainer.items setObject:projectContainer forKey:projectKey];
if(projectContainer) {
[projectContainer release];
projectContainer = nil;
}