helpers.ex

defmodule MyApp.Controllers.Helpers do
  import Plug.Conn
  import Phoenix.Controller

  def render_blank(conn) do
    conn
    |> send_resp(204, "")
  end
  
  def render_error(conn, status, opts) do
    conn 
    |> put_status(status)
    |> render(MyApp.ErrorView, "#{status}.json", opts)
  end

  def ensure_current_user(conn, _) do
    case conn.assigns.current_user do
      nil -> render_error(conn, 401, message: "unauthorized")
      current_user -> conn
    end
  end

end