Building a web app using the DSLs

Let’s take the web app we built in Chapter 7 as a starting point. Before making any changes, let’s ensure the app is still running properly by running the following command:

$ mix run --no-halt

Let’s go to http://localhost:4040/tasks in our browsers to make sure the page is rendered as follows:

Figure 9.1: Expected page

At this point, the TasksWeb.TaskController module should look as follows:

lib/tasks_web/controller/task_controller.ex

defmodule TasksWeb.TaskController do
  use Plug.Builder
  import Plug.Conn
  alias TasksWeb.Tasks
  def call(conn, action: action) do
    conn = super(conn, [])
    apply(__MODULE__, action, [conn, conn.params])
  end
  def index(conn, _params) do
    tasks = Tasks.list()
    conn
    |> put_status...