I have an array of dictionaries.
I want to filter the array based on a key.
I tried this:
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(SPORT == %@)", @"Football"];
NSArray *filteredArray = [data filteredArrayUsingPredicate:predicate];
This doesn't work, I get no results. I think I'm doing something wrong. I know this is the method if "SPORT" was an ivar. I think it is probably different if it is a key.
I haven't been able to find an example however.
Thanks
Update
I added quotes around the string I am searching for.
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(SPORT == '%@')", @"Football"];
It still does not work.
Update 2
Solved it. I actually had to remove the single quotes, which seems to go against what the guide says.
My real problem is I had a nested array and I wasn't actually evaluating the dictionaries. Bone head move.
It should work - as long as the data variable is actually an array containing a dictionary with the key SPORT
NSArray *data = [NSArray arrayWithObject:[NSMutableDictionary dictionaryWithObject:@"foo" forKey:@"BAR"]];
NSArray *filtered = [data filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"(BAR == %@)", @"foo"]];
Filtered in this case contains the dictionary.
(the %@ does not have to be quoted, this is done when NSPredicate creates the object.)