Serialize nested image in RestKit (Rails Backend) - objective-c

Question

Here's what I'm getting:
food_name_token Pizza
id 1
category_id 1
review {"note"=>"tasty!", "image"=>"<RKParamsAttachment: 0x7834500>"}
And this is what I'm expecting:
food_name_token Pizza
id 1
category_id 1
review {"note"=>"tasty!", "image"=>{"filename"=>"image", "type"=>"image/png", "name"=>"image", "tempfile"=>"#", "head"=>"Content-Disposition: form-data; name=\"image\"; filename=\"image\"\r\nContent-Type: image/png\r\n"}}
I'm using Restkit and I'm trying to serialize my data on the Iphone and send it to my Rails backend. For the most part, it works, but I just can't seem to get my multipart image to serialize.
The image belongs to a 'Review' class, which in turn is nested in a 'Dish' class. Here is what I have so far:
// Set up routes
RKObjectManager* manager = [RKObjectManager objectManagerWithBaseURL:#"http://postbin.org"];
[manager.router routeClass:[Dish class] toResourcePath:#"/5a850fe1" forMethod:RKRequestMethodPOST];
[manager.router routeClass:[Review class] toResourcePath:#"/5a850fe1" forMethod:RKRequestMethodPOST];
// Map Dish Object
RKObjectMapping *dishMapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[dishMapping mapKeyPath:#"id" toAttribute:#"identifier"];
[dishMapping mapKeyPath:#"category_id" toAttribute:#"categoryID"];
[dishMapping mapKeyPath:#"food_name_token" toAttribute:#"name"];
// Map Review Object
RKObjectMapping *reviewMapping = [RKObjectMapping mappingForClass:[Review class]];
[reviewMapping mapKeyPath:#"note" toAttribute:#"note"];
[reviewMapping mapKeyPath:#"image" toAttribute:#"image"];
// Define the relationship mapping
[dishMapping mapKeyPath:#"review" toRelationship:#"review" withMapping:reviewMapping];
// Set serialization for Dish Class
RKObjectMapping* dishSerializationMapping = [dishMapping inverseMapping];
[[RKObjectManager sharedManager].mappingProvider setSerializationMapping:dishSerializationMapping forClass:[Dish class] ];
// Set serialization for Review Class
RKObjectMapping* reviewSerializationMapping = [reviewMapping inverseMapping];
[[RKObjectManager sharedManager].mappingProvider setSerializationMapping:reviewSerializationMapping forClass:[Review class] ];
Then I assign the values:
[Dish sharedDish].name = #"Pizza";
[Dish sharedDish].identifier = [NSNumber numberWithInt:1];
[Dish sharedDish].categoryID = [NSNumber numberWithInt:1];
[Review sharedReview].note = #"tasty!";
// Turn an image into an RKParamsAttachment object and assign it to the image attribute of the Review class
RKParams* params = [RKParams params];
UIImage* imageOrig = [UIImage imageNamed:#"pizza.jpg"];
NSData* imageData = UIImagePNGRepresentation(imageOrig);
RKParamsAttachment* image = [params setData:imageData MIMEType:#"image/png" forParam:#"image"];
[params release];
[Review sharedReview].image = image;
And then I assign my Review object to my Dish object's review attribute and send it off:
[Dish sharedDish].review = [Review sharedReview];
[[RKObjectManager sharedManager] postObject:[Dish sharedDish] delegate:self];
It seems like I'm attaching the image to the object the wrong way.
What's the right way to do it?

Answer 1

Did you try manually adding the nesting to the param name:
RKParamsAttachment* image = [params setData:imageData
MIMEType:#"image/png" forParam:#"review[image]"];