How to parse complex JSON using RestKit?

Question

iOS

Good afternoon!
I just started learning iOS and RestKit, so don't kick me :)
You need to parse the following json response using RestKit:
{"response":["60289",{"ID":"15405114","HEADER":"…"}, {"ID":"15405113","HEADER":"…"},{"ID":"15405112","HEADER":"…"}]}
60289 – total number of records in the allocated database.
It is required to get an array of Messages - ID, HEADER, ..
I created two classes:

@interface Agancy : NSObject

@property (nonatomic, assign) long id;
@property (nonatomic, strong) NSString *name;

-(id) initWithDictionary:(NSDictionary*)source {
  self = [super init];
  if (self) {
    self.id = [[source valueForKey@"agancy"] longValue];
    self.name = [source valueForKey@"agancy_name"];
  }
  return self;
}

@interface Message : NSObject

@property (nonatomic, assign) long id;
@property (nonatomic, strong) NSString *header;
@property (nonatomic, strong) Agancy *agancy;

-(id) initWithDictionary:(NSDictionary*)source {
  self = [super init];
  if (self) {
    self.id = [[source valueForKey@"id"] longValue];
    self.header = [source valueForKey@"header"];
    self.agency = [[Agancy alloc] initWithDictionary:source];
  }
  return self;
}

And wrote the following code:

-(void) loadMessages {
  AppDelegate *delegate = [[UIApplication sharedApplication]delegate];
  RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[Message class]];
  RKResponseDescriptor *response = [RKResponseDescriptor responseDescriptorWithMapping:mapping
    Method:RKRequustMethodGet
    pathPattern:@"/messages.get"
    keyPath:@"responde"
    statusCodes:[NSIndexSet indexSetWithIndex:200]];
  [delegate.objectManager addResponseDescriptor response];
  
  [delegate.objectManager getObjectsAtPath:@"/messages.get"
    parameters:nil
    success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
      NSLog(@"success");
    } failure:^( RKObjectRequestOperation *operation, NSError *error) {
      NSString @msg = [NSString stringWithFormat:@"Ошибка %@", error.localizedDescription];
      NSLog(@"%@", msg);
    }
];
}

The above code throws an error:
Loaded an unprocessable response (200) with content type 'application/jason'
What am I doing wrong??
Sincerely,
Alexander.

Answer 1

RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[Message class]];

The restkit does not generate mappings itself, you need to explicitly tell it which JSON field to map to which object property, this time.
typo?
"response" is an array, but it contains more than one type of objects, so dynamic mapping is needed (it's better to slap the hands of the one who wrote this api)

RKObjectMapping *messageMapping = [RKObjectMapping mappingForClass:[Message class]];
[messageMapping addAttributeMappingsFromDictionary:@{ @"ID": @"id", @"HEADER" : @"header" }];