title: RestKit pathpatterns including IDs
body: <p>So the problem is that when I'm trying to load entity from <a href="http://dealer-app.net/api/cars/2/features.json?auth_token=Mg7Kd7pb1CG9dBZmx4Q9" rel="nofollow">here</a> I'm not getting things to work. My Pathpatterns seems to be wrong.
  Here's my Mapping and Descriptor:</p>
  
  <pre><code>RKEntityMapping *statsMapping = [RKEntityMapping mappingForEntityForName:@"Stat" inManagedObjectStore:managedObjectStore];
  
  [statsMapping addAttributeMappingsFromDictionary:@{
   @"sort_id" : @"sortID",
   @"id" : @"statID",
   @"deleted" : @"deletedFlag",
   @"created_at": @"createdAt",
   @"updated_at": @"updatedAt"
   }];
  statsMapping.identificationAttributes = @[ @"statID" ];
  [statsMapping addAttributeMappingsFromArray:@[ @"title"]];
  
  
  RKEntityMapping *featuresMapping = [RKEntityMapping mappingForEntityForName:@"Feature" inManagedObjectStore:managedObjectStore];
  
  [featuresMapping addAttributeMappingsFromDictionary:@{
   @"sort_id" : @"sortID",
   @"id" : @"featureID",
   @"deleted" : @"deletedFlag",
   @"created_at": @"createdAt",
   @"updated_at": @"updatedAt",
   }];
  featuresMapping.identificationAttributes = @[ @"featureID" ];
  [featuresMapping addAttributeMappingsFromArray:@[ @"title", @"value"]];
  [statsMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"features" toKeyPath:@"features" withMapping:featuresMapping]];
  
  RKResponseDescriptor *statsDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:statsMapping
                                                                                    pathPattern: @"/api/cars/:carID/features.json"
                                                                                        keyPath:nil
                                                                                    statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
  [objectManager addResponseDescriptorsFromArray:@[newsDescriptor, catalogDescriptor, statsDescriptor]];
  </code></pre>
  
  <p>So when I use pathPattern:nil it works, but if no answer is returned by url it just tries to put another responsedescriptor to the response and gives me random data :) </p>
  
  <p>The question is, if I have the car ID in the middle of the pattern, how should I declare it?</p>
  
  <p>Thank you!</p>
  
  <p>Edit1: This is how I do request:</p>
  
  <pre><code>    - (void)getStats:(NSNumber *)carID
      {
      [[RKObjectManager sharedManager] getObjectsAtPath:[NSString stringWithFormat:@"api/cars/%@/features.json", carID]
                                             parameters:@{@"auth_token" : [Constants authToken]}
                                                success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                                    RKLogInfo(@"Load complete: Stats loaded");
                                                }
                                                failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                                    RKLogError(@"Load failed with error: %@", error);
                                                    [self showError:error withDelay:3];
                                                }];
  }
  </code></pre>