Building a view interface

In order to build a view interface, let’s first start with the example_server_html_eex app that we built in the previous chapter. In this app, we made the controller module responsible for both capturing a request from a router and rendering the final HTML. In this section, we will start by moving the rendering responsibility to Goldcrest.View.

We can start by defining the Goldcrest.View module that can house the render/3 function, which evaluates the EEx template and calls the render function in the Goldcrest.Controller module.

Let’s create a new file in the goldcrest package:

lib/goldcrest/view.ex

defmodule Goldcrest.View do
  require EEx
  alias Goldcrest.Controller
  def render(conn, file, assigns) do
    contents =
      file
      |> html_file_path()
      |> EEx.eval_file(assigns...