ios - Regarding memory management in Objective C -

according static analyzer if have following property:

@property (retain, nonatomic) someobject * object; 

and assign property so:

self.object = [someobject alloc] init]; 

a leak occurs. makes sense because alloc init adds +1 retain count , retaining property increments retain count. best solution here? typically add autorelease so:

self.object = [[someobject alloc] init] autorelease]; 

but creates problems me , end on releasing object causing app crash. don't have specific examples right remember had take out autoreleases cause of application crashing. there missing here?

edit: have concrete example of issue running into.

    nsmutablearray *newdata = [nsmutablearray array];      //if true showing of items in level of hierarchy , not need show summary button.     if (!(contextid.count >= 1 && [[contextid objectatindex:contextid.count - 1] isequal:[nsnull null]]) && contextid.count != 0)     {         geographypickeritem * firstitem = [[geographypickeritem alloc] init];          firstitem.primarystring = [nsstring stringwithstring:@"summary"];         firstitem.substring = [nsstring stringwithstring:@""];         firstitem.issummaryitem = yes;          [newdata addobject:firstitem];         [firstitem release]; //todo: figure out why causing exc_bad_access errors     }      self.hierdata = newdata; 

the code above in init method of viewcontroller. hierdata retained property, released in viewcontrollers dealloc method. geographypickeritem retains 2 strings, primarystring , substring , releases them in own dealloc method. application crashes (sometimes) when viewcontrollers de-alloced following pop off of navigation controller. crashes exc_bad_access signal in dealloc method of geographypickeritem (either on [substring release] or [primarystring release]).

i don't understand why happening because believe following proper memory management guidelines. if comment out firstitem release fine.

the autorelease method mention fine, other common idiom of:

someobject *thing = [[someobject alloc] init]; self.object = thing; [thing release]; 

if end overreleasing later on, that problem. part, you're apparently doing correctly, not problem.