Custom routing in Web API 2. Failing to reach controller method

Question

I have a method inside of my controller which I am trying to reach:

[HttpPost, ActionName("UpdateTitle")]
public IHttpActionResult UpdateTitle(Guid playlistId, string title)
{
    using (ITransaction transaction = Session.BeginTransaction())
    {
        PlaylistManager.UpdateTitle(playlistId, title);

        transaction.Commit();
    }

    return Ok();
}

I have another method in the controller which is also a POST and is the method which is actually being hit by my request (erroneously):

[HttpPost]
public PlaylistDto Create(PlaylistDto playlistDto)

Here's what my raw request information looks like:

Here's my routing:

public static class WebApiConfig
{
    //  TODO: Create test cases for custom routing.
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services
        config.Routes.MapHttpRoute("UpdateTitle", "Playlist/UpdateTitle/{playlistId}/{title}");

        //  TODO: What does this do?
        // Web API routes
        //config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

    }
}

Why on earth is it redirecting to the Create method? The signature looks correct to me for being routed to the UpdateTitle method.

Answer 1

First you need to create a class that contains all your form data. You may be able to use your PlaylistDto class for this:

public class PlaylistDto
{
    public Guid PlaylistId { get; set; }
    public string title { get; set; }
}

Then change your UpdateTitle method to:

[HttpPost, ActionName("UpdateTitle")]
public IHttpActionResult UpdateTitle(PlaylistDto Dto)
{
    using (ITransaction transaction = Session.BeginTransaction())
    {
        PlaylistManager.UpdateTitle(Dto.playlistId, Dto.title);

        transaction.Commit();
    }

    return Ok();
}

Finally change your routing as follows:

public static class WebApiConfig
{
    //  TODO: Create test cases for custom routing.
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services
        config.Routes.MapHttpRoute(
            name: "UpdateTitle",
            routeTemplate: "Playlist/UpdateTitle",
            defaults: new { controller = "PlaylistController", action = "UpdateTitle" }
         );    

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

    }
}

Answer 2

Try to declare like this, see if it helps (since I believe you're sending your parameters in the body of the request:

public IHttpActionResult UpdateTitle([FromBody]Guid playlistId, [FromBody]string title)