Accessing the database .sqlite via sql normally, I can use the CAST('coluna' as decimal) function.
Via NSPredicate using CoreData , how do I do the same thing? I have a column of type String and I need to make a cast to decimal .
It is possible to have CAST in an NSPredicate.
The syntax is:
CAST(<o que vai ser convertido>, 'classe destino')
Example:
NSArray *array = @[@"10.0", @"8.99"];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"CAST(self, 'NSNumber') > %@", [NSNumber numberWithDouble:9.0]];
NSLog(@"%@", [array filteredArrayUsingPredicate:predicate]);
In your case, assuming that your entity's ownership in CoreData is "latitude":
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"CAST(latitude, 'NSNumber') > %@", [NSNumber numberWithDouble:9.0]];
More examples here: link