使用AFHTTPRequestOperation构造URL(包括花括号)

我需要使用AFNetworking这个问题来构建这样的URL ,{以及}如何通过parameter

/api/sth.json?filter[condition]={"53891":[123],"53892":[123,124]}

所以我的代码看起来像这样(我更简单):

[self GET:myUrl parameters:@{
                             @"filter" : @{
                                     @"condition" : @{
                                             @"53891" : @[@(123)],
                                             @"53892" : @[@(123),@(124)]}
                                     },

                             } success:^(AFHTTPRequestOperation *operation, id responseObject) {
                                 success(operation,responseObject);
                             } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                 failure(operation,error);
                             }];

但它产生的不是预期的产量:

/api/sth.json?filter[condition][53891][]=123&filter[condition][53892][]=123&filter[condition][53892][]=124

有一种方法可以在parametersin AFHTTPRequestOperation或手动我必须把它放入字符串？

编辑:

我目前的解决方案是这样的:

+(NSString*)convertFromDictionary:(NSDictionary*)dic {
    NSMutableString *outputStr = [NSMutableString new];
    [outputStr appendString:@"{"];
    NSArray *allKeys = [[dic allKeys] sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:nil ascending:NO]]];
    for(NSString *key in allKeys) {
        NSArray *objects = dic[key];
        [outputStr appendString:[NSString stringWithFormat:@"\"%@\":[",key]];
        for(NSNumber *nb in objects) {
            [outputStr appendString:[NSString stringWithFormat:@"%li",[nb longValue]]];
            if(![nb isEqual:[objects lastObject]]) {
                [outputStr appendString:@","];
            } else {
                [outputStr appendString:@"]"];
            }
        }
        if(![key isEqual:[allKeys lastObject]]) {
            [outputStr appendString:@","];
        }
    }
    [outputStr appendString:@"}"];
    return outputStr;
}

输入字典是: @{@"53892" : @[@(123),@(124)]}

但它只不过是字符串比较.没有更聪明的方法来直接实现AFNetworking,因为它是相当标准的URL参数？