RestKit ios - put - json instead of form encoded - objective-c

Question

i am writing an ios app that uses restkit to communicate with a web server through Rest with JSON
i am able to use [[RKObjectManager sharedManager] loadObjectsAtResourcePath:path delegate:self] to get object from my web service as JSON, map it to obj-c object, it works fine
now i am trying to use: [[RKObjectManager sharedManager] putObject:obj delegate:self]; and this call sends an object to the web service as form encoded and not JSON
so my question is: how to configure the sharedManager (or the routeur?) to send with content type JSON instead of form encoded.
any code example much appreciated.
Thx!

Answer 1

The easiest way is to simply set the property when you initialize the object manager, like so:
RKObjectManager* objectManager = [RKObjectManager objectManagerWithBaseURL:#"http://url.com"];
objectManager.serializationMIMEType = RKMIMETypeJSON;

Answer 2

Evan is correct, but I've had to also make sure I am sending a JSON string, because I had a nested NSDictionay.
If you have a dictionary you want to send as a JSON string, here's how you can do it:
// create a JSON string from your NSDictionary
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict
options:NSJSONWritingPrettyPrinted // Pass 0 if you don't care about the readability of the generated string
error:&error];
NSString *jsonString = [[NSString alloc] init];
if (!jsonData) {
NSLog(#"Got an error: %#", error);
} else {
jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}
// make the post using the objectManager if you want to map the response to a model
RKObjectManager* objectManager = [RKObjectManager sharedManager];
[objectManager loadObjectsAtResourcePath:#"/api/" delegate:self block:^(RKObjectLoader* loader) {
loader.serializationMIMEType = RKMIMETypeJSON; // We want to send this request as JSON
loader.objectMapping = [objectManager.mappingProvider objectMappingForClass:[Plan class]];
loader.resourcePath = #"/api/";
loader.method = RKRequestMethodPOST;
loader.params = [RKRequestSerialization serializationWithData:[jsonString dataUsingEncoding:NSUTF8StringEncoding] MIMEType:RKMIMETypeJSON];
}];

Answer 3

Okay just found how to do it:
subclass RKRouter.h or just change in RKDynamicRouter.m
return [object propertiesForSerialization];
to
[RKJSONSerialization JSONSerializationWithObject:[object propertiesForSerialization]];
and RestKit generate JSON for putObject call

Answer 4

Create an Object Manager and set the property for matching the header in JSON format
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:#"http://mobile.com"]];
[objectManager addResponseDescriptorsFromArray:#[responseDescriptor]];
objectManager.requestSerializationMIMEType = RKMIMETypeJSON;

Answer 5

You can change serializationMIMEType for individual requests by subclassing RKObjectManager and change implementation of requestWithObject:method:path:parameters: in subclassed manager.
Send request:
SubclassedObjectManager *manager = ...
[manager putObject:nil
path:pathString
parameters:parameters
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
}
];
Modify MIMEType of request for PUT method:
- (NSMutableURLRequest *)requestWithObject:(id)object method:(RKRequestMethod)method path:(NSString *)path parameters:(NSDictionary *)parameters
{
NSMutableURLRequest *request = [super requestWithObject:object method:method path:path parameters:parameters];
if (method&RKRequestMethodPUT) {
NSError *error = nil;
NSData *serializedJSON = [RKMIMETypeSerialization dataFromObject:parameters MIMEType:RKMIMETypeJSON error:&error];
[request setValue:RKMIMETypeJSON forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:serializedJSON];
}
return request;
}