Getting Error While Mapping Objects in RestKit 0.20 - ios

Question

I am working on Rest Kit 0.2o, I am using some sample URL for Json format from Web, the response is like Below. I am using Object Mapping. I am following the below link as reference
"https://github.com/RestKit/RestKit/wiki/Object-Mapping" I am using almost same response given in the link.
{
"geonames": [
{
"fcodeName":"capital of a political entity",
"toponymName":"Mexico City",
"countrycode":"MX",
"fcl":"P",
"fclName":"city, village,...",
"name":"Mexiko-Stadt",
"wikipedia":"en.wikipedia.org/wiki/Mexico_City",
"lng":-99.12766456604,
"fcode":"PPLC",
"geonameId":3530597,
"lat":19.428472427036,
"population":12294193
},
{
"fcodeName":"capital of a political entity",
"toponymName":"Manila",
"countrycode":"PH",
"fcl":"P",
"fclName":"city,village,...",
"name":"Manila",
"wikipedia":"en.wikipedia.org/wiki/Manila",
"lng":120.9822,
"fcode":"PPLC",
"geonameId":1701668,
"lat":14.6042,
"population":10444527
}]
}
Below is the code
RKObjectMapping *newsMapping = [RKObjectMapping mappingForClass:[News class]];
[newsMapping addAttributeMappingsFromDictionary:#{
#"fcodeName": #"fcodeName",
#"toponymName": #"toponymName",
#"countrycode": #"countrycode",
#"fcl": #"fcl",
#"fclName": #"fclName",
#"name":#"name",
#"wikipedia":#"wikipedia",
#"lng":#"lng",
#"fcode":#"fcode",
#"geonameId":#"geonameId",
#"lat":#"lat",
#"population":#"population",
}];
RKResponseDescriptor* responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:newsMapping
pathPattern:nil
keyPath:#"newsMapping"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
NSURL* url = [[NSURL alloc]initWithString:#"http://api.geonames.org/citiesJSON?north=44.1&south=-9.9&east=-22.4&west=55.2&lang=de&username=demo"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
RKObjectRequestOperation *objectRequestOperation = [[RKObjectRequestOperation alloc] initWithRequest:request responseDescriptors:#[ responseDescriptor ]];
[objectRequestOperation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
RKLogInfo(#"Load collection of Articles: %#", mappingResult.array);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
// RKLogError(#"Operation failed with error: %#", error);
NSLog(#"THIS IS TEST %#",error);
}];
[objectRequestOperation start];
"News" is the class i am using and KeyPath i am using is "geonames"
#interface News : NSObject
#property(nonatomic,copy)NSString* fcodeName;
#property(nonatomic,copy)NSString* toponymName;
#property(nonatomic,copy)NSString* countrycode;
#property(nonatomic,copy)NSString* fcl;
#property(nonatomic,copy)NSString* fclName;
#property(nonatomic,copy)NSString* name;
#property(nonatomic,copy)NSString* wikipedia;
#property(nonatomic,copy)NSString* lng;
#property(nonatomic,copy)NSString* fcode;
#property(nonatomic,copy)NSString* geonameId;
#property(nonatomic,copy)NSString* lat;
#property(nonatomic,copy)NSString* population;
After doing all this I am getting below error
2013-05-30 12:06:14.376 TestApp[7140:11603] I restkit.network:RKObjectRequestOperation.m:174 GET 'http://api.geonames.org/citiesJSON?north=44.1&south=-9.9&east=-22.4&west=55.2&lang=de&username=demo'
2013-05-30 12:06:15.477 TestApp[7140:12b07] E restkit.network:RKObjectRequestOperation.m:236 Test GET 'http://api.geonames.org/citiesJSON?north=44.1&south=-9.9&east=-22.4&west=55.2&lang=de&username=demo' (200 OK / 0 objects) [request=1.0969s mapping=0.0000s total=1.1056s]: Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No mappable object representations were found at the key paths searched." UserInfo=0x7675f20 {DetailedErrors=(
), NSLocalizedFailureReason=The mapping operation was unable to find any nested object representations at the key paths searched: newsMapping
The representation inputted to the mapper was found to contain nested object representations at the following key paths: status
This likely indicates that you have misconfigured the key paths for your mappings., NSLocalizedDescription=No mappable object representations were found at the key paths searched., keyPath=null}
2013-05-30 12:06:15.477 TestApp[7140:14d03] blockk
2013-05-30 12:06:15.478 TestApp[7140:14d03] erorrrrrr next ifr
2013-05-30 12:06:15.478 TestApp[7140:14d03] erorrrrrr next ifjhkr
2013-05-30 12:06:15.478 TestApp[7140:11603] THIS IS TEST Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No mappable object representations were found at the key paths searched." UserInfo=0x7675f20 {DetailedErrors=(
), NSLocalizedFailureReason=The mapping operation was unable to find any nested object representations at the key paths searched: newsMapping
The representation inputted to the mapper was found to contain nested object representations at the following key paths: status
This likely indicates that you have misconfigured the key paths for your mappings., NSLocalizedDescription=No mappable object representations were found at the key paths searched., keyPath=null}
Actually in error it is showing keyPath as null in last line But in Browser i am getting the response i have mentioned above.
Please Help

Answer 1

Your response descriptor keypath is wrong. Change to:
RKResponseDescriptor* responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:newsMapping pathPattern:nil keyPath:#"geonames" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
The error you're seeing currently would seem to be because the JSON actually returned is:
{"status":{"message":"the deaily limit of 30000 credits for demo has been exceeded. Please use an application specific account. Do not use the demo account for your application.","value":18}}
Which obviously does not match what you're expecting...