NSPredicate issue with greater than equals

Question

I have a simple NSPredicate which is not giving correct result

NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"SELF.data.squareFootage >= %@", filterSquareFootage];
filteredArray = [[filteredArray filteredArrayUsingPredicate:resultPredicate] mutableCopy];

Strangely this works for all 6000>=250, 7000>=250, 8000>=6000. But as soon as squareFootage==10000 the predicate for 10000>=any smaller value is false. Note: 10000 for squareFootage is a max value fetched using a UISlider.If i reduce value to any smaller value, the predicate gives true as result

Am i missing something here and using predicate incorrectly?

Answer 1

I assume that your property is stored as string and not as number, therefore the values are compared as strings:

"10000" < "250" < "6000"

Using NSNumber instead of NSString (or alternatively some scalar type as NSInteger) should fix the problem.

If you cannot change the data type of the squareFootage property, then the following predicate should work:

[NSPredicate predicateWithFormat:@"SELF.data.squareFootage.intValue >= %d", [filterSquareFootage intValue]]