Wrong route pick up by Phoenix Routes.path

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1

Hi, may I know why does my Routes.path pick up the wrong route?

I have only two routes for this entity

presentation_session_path  GET     /api/presentations/:presentation_id/sessions/:id  SentiWeb.SessionController :show
presentation_session_path  POST    /api/presentations/:presentation_id/sessions      SentiWeb.SessionController :create

In my session create method

  def create(conn, %{"session" => session_params}) do
    with {:ok, %Sessions{} = session} <- Questionnaire.create_session(session_params) do
      conn
      |> put_status(:created)
      |> put_resp_header("location", Routes.presentation_session_path(conn, :show, session))
      |> render("show.json", session: session)
    else
      _ -> json(conn, %{Message: "Please enter the questions for the selected presentation!"})
    end
  end

In |> put_resp_header line, I expect the GET route path would be pick up but it wasn’t and instead its the POST method as per Dialyzer

Dialyzer warning:

positions 2nd from the success typing arguments:
(atom() | struct(), :create, any())
ElixirLS Dialyzer

Can someone enlighten me, why would Routes.presentation_session_path expects :create as expected argument instead of :show?

2

Can you share the relevant part of your routes? You mentioned that you defined two routes but only shared one with us.

3

Post updated. The other route wasn’t shown in the post.

4

You do not provide presentation_id, so it thinks session is presentation_id, and session_id is nil → post path.

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