How to combine paths from multiple routers for Openapispex (swagger) documentation?

defmodule KayaanPrintsWeb.Router.AdminRouter do
  use KayaanPrintsWeb, :router

  pipeline :api do
    plug :accepts, ["json"]
    plug :fetch_session
  end

  scope "/v1" do
    pipe_through :api

    scope "/", KayaanPrintsWeb do
      get "/", DefaultController, :index

      forward "/medias/", Router.MediaRouter
      forward "/products/", Router.ProductRouter
      forward "/collections/", Router.CollectionRouter
    end
  end
end

This is the admin router which forwards requests to other routers. I want to create documentation for all of the endpoints of these 3 routers on a single page. so I have defined this module:

defmodule KayaanPrintsWeb.SuperAdminApiSpec do
  alias OpenApiSpex.{Components, Contact, Info, OpenApi, Paths, Server, SecurityScheme}
  alias KayaanPrintsWeb.Endpoint
  alias KayaanPrintsWeb.Router.AdminRouter

  @behaviour OpenApi

  @impl OpenApi
  def spec do
    %OpenApi{
      components: %Components{
        securitySchemes: %{
          "authorization" => %SecurityScheme{
            type: "http",
            scheme: "bearer",
            bearerFormat: "JWT"
          }
        }
      },
      servers: [
        Server.from_endpoint(Endpoint)
      ],
      info: %Info{
        title: "Kayaan Prints Super Admin API",
        description: "API documentation for Kayaan Prints Super Admin Management",
        contact: %Contact{
          name: "name",
          email: "email"
        },
        version: to_string(Application.spec(:kayaan_prints, :vsn))
      },
      paths: merge_paths(AdminRouter)
    }
    |> OpenApiSpex.resolve_schema_modules()
  end
end

And I have defined the super-admin router which contains the endpoint for swaggerui. Now when I open the swaggerui page, it says: No operations defined in spec!. So it’s not working for forwarded endpoints.

Then, I tried merging the paths of all the 3 routers like this:

....
paths: merge_paths([ProductRouter, MediaRouter, CollectionRouter])
....
defp merge_paths(routers) do
    routers
    |> Enum.flat_map(& &1.__routes__())
    |> Paths.from_routes()
  end

now it’s overwriting the operations with the same name. for example, ProductController and MediaController contains index function and hence :index operation. So the index operation from product controller will be overwritten by the index operation from the media controller. and at the end I get doc for only 5 endpoints out of many. Furthermore, they do not contain the correct endpoint prefix as seen in the image I have attached.

image1852×497 18.5 KB

So is there any ideal way of listing all the endpoints from multiple routers altogether?