Question

I have a controller for my entire database, the code is below:

public class YogaController : DbDataController<Yoga.Models.YOGAEntities>
{
    public YogaController()
    {
    }

    public IQueryable<Yoga.Models.Action> GetActions(int BugId)
//GetActions retrieves "actions" table from the db, not Actions in MVC term 
    {
        return DbContext.Actions.Where(x => x.FK_BugsID == BugId);
    }
    public IQueryable<Yoga.Models.Label> GetRequiredLabels()
    {
        return DbContext.Labels.Where(x => x.IsRequired == true);
    }
    public IQueryable<Yoga.Models.Role> GetRoles()
    {
        return DbContext.Roles;
    }
    public IQueryable<Role> GetRoles2() //TODO: finish this
    {
        return DbContext.Roles.Where(x => x.RoleID == 1);
    }
    public IQueryable<Tag> GetTags(int actionid)
    {
        return DbContext.Tags.Where(x => x.J_Tags.Any(y => y.FK_ActionID == actionid));
    }
}

As you can see I have multiple IQueryable in one controller, each querying a different table. Is it something that’s forbidden? Because when I go to localhost/api/Yoga/GetActions or localhost/api/Yoga/GetRequiredLabels I get the error message:

Multiple actions were found that match the request: 
 System.Linq.IQueryable`1[Yoga.Models.Label] GetRequiredLabels() on type Yoga.Controllers.YogaController
 System.Linq.IQueryable`1[Yoga.Models.Role] GetRoles() on type Yoga.Controllers.YogaController
 System.Linq.IQueryable`1[Yoga.Models.Role] GetRoles2() on type Yoga.Controllers.YogaController

When I disable all but one IQueryable, the results came out fine.

I have googled for similar issues and checked my routing settings, there are no conflicts in controller path and names.

My Routes (default generated):

    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
        routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
        //routes.MapRoute(
        //    name: "Default",
        //    url: "{controller}/{action}/{id}",
        //    defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );
    }

Any ideas?

Answer 1

MVC4 is probably matching your HTTP Verb (Get) against all methods with names starting with ‘Get’ and no parameters. Try forcing the action name:

[ActionName("GetRequiredLabels")]
public IQueryable<Yoga.Models.Label> GetRequiredLabels()
...
[ActionName("GetActions")]
public IQueryable<Yoga.Models.Action> GetActions(int BugId)
... // etc

EDIT:

Based on the routes you pasted and your controller, I think your routes should be:

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
    routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "api/{controller}/{action}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );
}

i.e. it should have the {action} in there. The default MVC4 route would work if you only had a single ‘Get’ method. Since you have multiple, you’ll have to force it to pick the action based on the route.