my_app_web.ex

defmodule MyAppWeb do
  # Locate views at "lib/my_app_web/[controller]/templates/[view].html.eex
  def view do
    quote location: :keep do
      use Phoenix.View,
        root:
          "lib/my_app/#{
            Regex.replace(
              ~r/View$/,
              __MODULE__ |> Module.split() |> Enum.slice(1..-1) |> Enum.join("."),
              ""
            )
            |> Macro.underscore()
          }/templates",
        path: "",
        namespace: MyAppWeb
    # ...
  end
end