Authorized NSMutableArray not populated

I want to populate an array as follows:

NSMutableArray *array = [self methodThatReturnsAnArray];

In the method method of methodThatReturnsAnArray, I create an array like this:

NSMutableArray *arrayInMethod = [[NSMutableArray alloc] init];

When I finished filling in "arrayInMethod", I return the array and to prevent the memory leak that I use:

return [arrayInMethod autorelease];

However, "array" -variable is never populated. However, when you delete the "abstract" it works fine. What should I do to make sure that the returned object that I released?

EDIT

+ (NSMutableArray *)buildInstants:(NSArray *)huntsArray {

    NSMutableArray *goGetObjects = [[[NSMutableArray alloc] init] autorelease];

    for (int i = 0; i < [huntsArray count]; i++) {

        NSDictionary *huntDict = [huntsArray objectAtIndex:i];

        PHGoGet *goGet = [[PHGoGet alloc] init];

        goGet.title = [huntDict objectForKey:@"title"];
        goGet.description = [huntDict objectForKey:@"description"];
        goGet.start = [huntDict objectForKey:@"start"];
        goGet.end = [huntDict objectForKey:@"end"];
        goGet.ident = [huntDict objectForKey:@"id"];

        if ((CFNullRef)[huntDict objectForKey:@"image_url"] != kCFNull) {

            goGet.imageURL = [huntDict objectForKey:@"image_url"];

        } else {

            goGet.imageURL = nil;
        }

        if ((CFNullRef)[huntDict objectForKey:@"icon_url"] != kCFNull) {

            goGet.iconURL = [huntDict objectForKey:@"icon_url"];

        } else {

            goGet.iconURL = nil;
        }

        goGet.longitude = [huntDict objectForKey:@"lng"];
        goGet.latitude = [huntDict objectForKey:@"lat"];
        goGet.companyIdent = [huntDict objectForKey:@"company_id"];

        [goGetObjects insertObject:goGet atIndex:i];
        [goGet release];
    }

    return [[goGetObjects copy] autorelease];
}