Restkit request.body values between square brackets - ios

Question

I'm doing a very basic POST request.
setting my requestSerializationMIMEType into RKMIMETypeFormURLEncoded as my server would expect (although it's the default).
Now in the log the request.body would look like this:
request.body=[param1]=test&[param2]=2724
Resulting unknown form values in the server.
The problem here is the param names, they're between square brackets, which I don't have an explanation why they're serialised like this!
My code is somehow exactly the same of the example provided on github.
NOTE: I have done the POST request manually without the square brackets and it's working fine.
EDIT
The code
RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[GenericResponse class]];
[responseMapping addAttributeMappingsFromDictionary:#{#"error":#"error", #"status":#"status"}];
NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful);
RKResponseDescriptor *genericDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:responseMapping method:RKRequestMethodAny pathPattern:#"" keyPath:#"" statusCodes:statusCodes];
RKObjectMapping *requestMapping = [RKObjectMapping requestMapping];
[requestMapping addAttributeMappingsFromDictionary:[User generateJSONMapping]];//dictionary mapping
RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping objectClass:[User class] rootKeyPath:#"" method:RKRequestMethodPOST];
RKObjectManager *manager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:#"https://foo.com/rest/createUser/"]];
[manager addRequestDescriptor:requestDescriptor];
[manager addResponseDescriptor:genericDescriptor];
manager.requestSerializationMIMEType=RKMIMETypeFormURLEncoded;
// POST to create
[manager postObject:user path:#"" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *result) {
NSLog(#"success");// the request is success but the params are not delivered to the server
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
NSLog(#"fail");
}];
The User is very simple I guess
#interface User : NSObject
#property NSNumber *idShort;
#property NSNumber *idLong;
#property NSNumber *idCom;
#property NSString *comment;
#property NSString *token;
+ (NSDictionary *) generateJSONMapping;
#end
#implementation User
+ (NSDictionary *) generateJSONMapping
{
return #{
#"idShort": #"idShort",
#"idLong": #"idLong",
#"idCom":#"idCom",
#"comment":#"comment",
#"token":#"token",
};
}
#end

Answer 1

The problem is in the RKRequestDescriptor, passing rootKeyPath as an empty string would cause this.
Passing nil would solve the problem.
RKRequestDescriptor *requestDescriptor = [
RKRequestDescriptor requestDescriptorWithMapping:requestMapping
objectClass:[User class]
rootKeyPath:nil
method:RKRequestMethodPOST];