Serialize nested image in RestKit (Rails Backend)

问题

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?

回答1:

Did you try manually adding the nesting to the param name:

RKParamsAttachment* image = [params setData:imageData 
    MIMEType:@"image/png" forParam:@"review[image]"];

来源：https://stackoverflow.com/questions/8203182/serialize-nested-image-in-restkit-rails-backend

标签

objective-c

ruby-on-rails

ios

multipart

restkit