title: Restkit complex Object Mapping, with nested object arrays, in Core Data
body: <p>i am using coredata and restkit to map data.</p>
  
  <p>here is the json response for getsales call</p>
  
  <pre><code>{   "success":true,
  "sales" : [
              {
          "brands" :[
          {"id":"637", "name":"XYZ"},
          {"id":"638", "name":"abc"}
          ]
          "end_date" = "2011-10-14 12:00:00",
          "id" = 3794,
          "image" = "http://dummy.something.com.jpg",
          "name" = "test",
      },
         {
         "brands" =[
          {"id":"640", "name":"abc"}
          ],
          "end_date" = "2011-10-14 12:00:00",
          "id" = 3766,
          "image" = "http://dummy.something.com.jpg",
          "name" = "text2",
      },
         {
         "brands" =[
          {"id":"641", "name":"XYZ"},
          {"id":"642", "name":"abc"},
          {"id":"643", "name":"def"}
          ],
          "end_date" = "2011-11-06 12:00:00",
          "id" = 3798,
          "image" = "http://dummy.something.com.jpg",
          "name" = "test3",
      }
  ]
  }
  </code></pre>
  
  <p>i have </p>
  
  <pre><code>@interface Sale : NSManagedObject{   
  }
  @property (nonatomic, retain) NSNumber * ID;
  @property (nonatomic, retain) NSString * name;
  @property (nonatomic, retain) NSDate * endDate;
  @property (nonatomic, retain) NSString * imageUrl;
  
  @implementation Sale
  
  @dynamic ID;
  @dynamic name;
  @dynamic startDate;
  @dynamic endDate;
  @dynamic imageUrl;
  </code></pre>
  
  <p>I am trying to map the response as following</p>
  
  <pre><code>- (void)getSales{
      RKObjectManager* objectManager = [RKObjectManager     objectManagerWithBaseURL:@"http://baseurl.com"];
      RKManagedObjectStore* objectStore = [RKManagedObjectStore     objectStoreWithStoreFilename:@"base.sqlite"];
  objectManager.objectStore = objectStore;
  
  
  RKManagedObjectMapping* saleMapping = [RKManagedObjectMapping mappingForClass:[Sale class]];
      [saleMapping mapKeyPathsToAttributes:
       @"id", @"ID",
       @"name", @"name",
       @"start_date",@"startDate",
       @"end_date", @"endDate",
       @"image", @"imageUrl",
       nil];
  
      saleMapping.primaryKeyAttribute = @"ID";
      [[RKObjectManager sharedManager].mappingProvider setMapping:saleMapping forKeyPath:@"sales"];
  
  [[RKObjectManager sharedManager] loadObjectsAtResourcePath:@"/getSales/" objectMapping:saleMapping delegate:self];
  }
  </code></pre>
  
  <p>essentially i have nested arrays of objects, what is the correct way to map these objects??
  and what type of property should Sale class have to store the brands list??</p>
  
  <p>Any help is appreciated, I already wasted too much time fixing this.</p>