Count number of entries from NSFetchRequest - iphone

Question

I have a method which is void but I have to count the number of entries in it.
So is there any way I can do it??
I tried to implement it but its not working.
It's giving me a error at Nsfetch count.
The return is declared as null.
testcase1
{
//startdate and end date are same and both are 1 day before
NSTimeInterval secondsPerday=24*60*60;
NSDate *startdate = [[NSDate alloc]initWithTimeIntervalSinceNow:-secondsPerday];
NSDate *endate = [[NSDate alloc]initWithTimeIntervalSinceNow:-secondsPerday];
TravelerAppDelegate *delegate =[[UIApplication sharedApplication]delegate];
[delegate getWeatherforCity:#"#" state:#"#" country:#"#" startDate:startdate endDate:endate];
NSManagedObjectContext *allone=[delegate managedObjectContext];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Weather" inManagedObjectContext:allone];
//WeatherXMLParser *delegate = [[WeatherXMLParser alloc] initWithCity:#"#" state:#"#" country:#"#"];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
[request setEntity:[NSEntityDescription entityForName:#"Weather" inManagedObjectContext:allone]];
[request setIncludesSubentities:NO];
NSError *err;
NSUInteger count = [allone countForFetchRequest:request error:&err];
if(count == NSNotFound) {
//Handle error
}
[request release];
return count;
}

Answer 1

First, you define the variable entity but when you set the entity of the fetch request, you are doing the same as above. Simply write:
[request setEntity:entity];
Then, NSFetchRequest has to have a sort descriptor array. So, add this:
[request setSortDescriptors:[NSArray array]];

Answer 2

If you want a method to return something, then set its return type.
-(void)testcase1
{
// Code goes here
}
Nothing (void) is returned. You'd call a method like this by:
[self testcase1];
To return something:
-(NSInteger)testcase1
{
// Code goes here
return count;
}
You would call such a method like this:
NSInteger count = [self testcase1];