I want to filter a calculated field (binary expression in terms of Apple documentation) in Core Data with a NSDecimalNumber value.
The entity has two attributes: field1 and field2, both of type Decimal
The predicate is:
NSDecimalNumber *number = ...;
NSString *predicateString = @"(field1 + field2) <= %@";
NSArray *arguments = [NSArray arrayWithObjects:number, nil];
[NSPredicate predicateWithFormat:predicateString argumentArray:arguments];
But this doesn't work. It gives nothing back.
When i filter each Attribute alone then it works. For example:
NSString *predicateString = @"field1 <= %@"; //ok
NSString *predicateString = @"field2 <= %@"; //ok
What's wrong?
