Restkit json error response msg from server

Question

I have used many hours on how to solve this issue. Im using Restkit 0.9.3 with Object Mapping 2.0. All data is in JSON. I can make GET, POST, PUT and DELETE operations corre

Answer 1

Using Restkit v0.2x you can map all JSON attributes you want to the already existing RKErrorMessage.userInfo Dictionary property in this [Swift] way:

let errorMapping = RKObjectMapping(forClass: RKErrorMessage.self);
errorMapping.addPropertyMapping(RKAttributeMapping(fromKeyPath: nil, toKeyPath: "userInfo"));

let errorResponseDescriptor = RKResponseDescriptor(
    mapping: errorMapping,
    method: RKRequestMethod.Any,
    pathPattern: nil,
    keyPath: "error", //or nil, according to your json response
    statusCodes: RKStatusCodeIndexSetForClass(UInt(RKStatusCodeClassClientError)))
);

So, you can map an error JSON response like this one:

{
    "error": {
        "message": "Error message",
        "cause": "...",
        "code": "my_error_code",
        "url": "..."
        ...
    }
}

And retrieve the RKErrorMessage with all attributes, in a failure closure, as follows:

failure: { (operation, error) -> Void in
    if let errorMessage = error.userInfo?[RKObjectMapperErrorObjectsKey]?.firstObject as? RKErrorMessage{
        let message = errorMessage.userInfo["message"] as! String;
        let code = errorMessage.userInfo["code"] as! String;
        ...
    }
}

I hope this can be helpful to someone!