Design

[kaiinui]

@interface TodoValidationSchema : AQSValidationSchema

- (NSDictionary *)schema {
    return @{
        @"title": [AQSPresenceValidator validator]
    };
}

@end

@interface AQSValidator

+ (instancetype)validatorForObject:(id)object 
                            schema:(AQSValidationSchema *)schema 
                           success:^(NSString *key)success 
                           failure:^(NSString *key, NSString *localizedDescription)failure;

@end