A little function to create an HTTP query from an NSPredicate

gistfile1.m

NSMutableDictionary *generateQueryPartForPredicate(NSPredicate *predicate)
{
    NSMutableDictionary *params             = [[NSMutableDictionary alloc] init];
    
    if([predicate isKindOfClass:[NSCompoundPredicate class]])
    {
        NSCompoundPredicate *compoundPredicate  = (NSCompoundPredicate *)predicate;
        
        for(NSComparisonPredicate *comparison in compoundPredicate.subpredicates)
            [params setValue:comparison.rightExpression.constantValue forKey:comparison.leftExpression.keyPath];
        
        return params;
    }
    else if([predicate isKindOfClass:[NSComparisonPredicate class]])
    {
        NSComparisonPredicate *comparePredicate = (NSComparisonPredicate *)predicate;
        [params setValue:comparePredicate.rightExpression.constantValue forKey:comparePredicate.leftExpression.keyPath];
        
        return params;
    }
    
    return [NSMutableDictionary new];
}