Service Stack POST-Request Body-Format / Transformation - json

Question

iam using a RequestClass with the Route anotation to call a Json-Client POST method.
Now, while the paramters are structured like this
public class GetTicketRequest: IReturn<JsonObject>
{
public string CartId {
get;
set;
}
public string PriceId {
get;
set;
}
}
The BackendAPI needs them to be nesten in "data" in the json request, so more like
{
"data":[
{"cartid":123,
"priceId":11}]
}
Is there any way to transfrom the request object for the body before calling
JsonServiceClient _restClient = new JsonServiceClient(baseUrl);
JsonObject oneResponse = _restClient.Post(options);

Answer 1

This solution is useful where many DTOs require to be wrapped & converted, and is highly reusable, with no changes to your existing DTOs.
You can convert the requests of the JsonServiceClient by overriding the methods that handle preparing the requests for sending. Which means implementing your own extended JsonServiceClient as given below.
If you want to do this for all verbs then you override it's Send<TResponse> methods (otherwise, if it's just for POST then uncomment the commented out code, and remove the Send methods).
public class MyJsonServiceClient : JsonServiceClient
{
public Dictionary<Type, Func<object, object>> DtoConverters = new Dictionary<Type, Func<object, object>>();
public MyJsonServiceClient() {}
public MyJsonServiceClient(string baseUri) : base(baseUri) {}
public MyJsonServiceClient(string syncReplyBaseUri, string asyncOneWayBaseUri) : base(syncReplyBaseUri, asyncOneWayBaseUri) {}
public override TResponse Send<TResponse>(object request)
{
return base.Send<TResponse>(ConvertRequest(request));
}
public override TResponse Send<TResponse>(string httpMethod, string relativeOrAbsoluteUrl, object request)
{
return base.Send<TResponse>(httpMethod, relativeOrAbsoluteUrl, ConvertRequest(request));
}
/*
public override TResponse Post<TResponse>(string relativeOrAbsoluteUrl, object requestDto)
{
return base.Post(relativeOrAbsoluteUrl, ConvertRequest(requestDto));
}
*/
object ConvertRequest(object request)
{
Type dtoType = request.GetType();
return (DtoConverters.ContainsKey(dtoType)) ? DtoConverters[dtoType](request) : request;
}
}
Usage:
So given this DTO:
[Route("/test", "POST")]
public class TicketRequest : IReturnVoid
{
public string CartId { get; set; }
public string PriceId { get; set; }
}
You simply add the converter:
var client = new MyJsonServiceClient("http://localhost:9000");
// Simple converter for TicketRequest
client.DtoConverters.Add(typeof(TicketRequest), dto => {
var d = (TicketRequest)dto;
return new {
data = new {
CartId = d.CartId.ToInt(),
PriceId = d.PriceId.ToInt()
}
};
});
client.Post(new TicketRequest { CartId = "123", PriceId = "456" });

Answer 2

i solved this issue using a typed data property
public class GetTicketRequest: IReturn<JsonObject>
{
public class TicketCreateData
{
public int priceId {
get;
set;
}
}
public string CartId {
get;
set;
}
public string PriceId {
get;
set;
}
public List<TicketCreateData> data {
get {
var list = new List<TicketCreateData>();
list.Add(new TicketCreateData {
priceId = this.PriceId.ToInt()
});
return list;
}
set {
data = value;
}
}
}
To notes on this:
if neede, use DataContract/DataMember(Name="") to rename fields or only do partial serializing
Do never use structs for, like in this case, the data class - they are not serializeable at all
in my spefici case data even needs to be an array, thats why i used the list