laurenfackler/email_preview_controller.ex

## email_preview_controller.ex
defmodule MyAppWeb.EmailPreviewController do
  use MyAppWeb, :controller

  plug(:put_layout, false)

  def index(conn, _) do
    emails =
      :functions
      |> Emails.__info__()
      |> Keyword.keys()
      |> Enum.uniq()
      |> List.delete(:render)

    render(conn, :index, emails: Enum.sort(emails))
  end

  def show(conn, %{"email" => email_name}) do
    email = apply(__MODULE__, String.to_existing_atom(email_name), [])
    render(conn, :show, %{email: email})
  end

  def appointment_booked_patient do
    appointment = get_booked_appointment()
    Emails.appointment_booked_patient(appointment)
  end

  defp get_booked_appointment do
    Appointment
    |> Appointments.booked()
    |> limit(1)
    |> Repo.one!()
  end
end

# in lib/my_app_web/templates/email_preview/index.html.erb
<html>
  <head>
    <title>Email Previews</title>
  </head>
  <body>
    <ul>
      <%= for email <- @emails do %>
        <li><a href="<%= "/email_previews/#{to_string(email)}" %>"><%= email %></a></li>
      <% end %>
    </ul>
  </body>
</html>

# in lib/my_app_web/templates/email_preview/show.html.erb
<div style="text-align:center">Subject: <strong><%= @email.subject %></strong></div>

<%= raw(@email.html_body) %>
	defmodule MyAppWeb.EmailPreviewController do
	use MyAppWeb, :controller

	plug(:put_layout, false)

	def index(conn, _) do
	emails =
	:functions
	\|> Emails.__info__()
	\|> Keyword.keys()
	\|> Enum.uniq()
	\|> List.delete(:render)

	render(conn, :index, emails: Enum.sort(emails))
	end

	def show(conn, %{"email" => email_name}) do
	email = apply(__MODULE__, String.to_existing_atom(email_name), [])
	render(conn, :show, %{email: email})
	end

	def appointment_booked_patient do
	appointment = get_booked_appointment()
	Emails.appointment_booked_patient(appointment)
	end

	defp get_booked_appointment do
	Appointment
	\|> Appointments.booked()
	\|> limit(1)
	\|> Repo.one!()
	end
	end

	# in lib/my_app_web/templates/email_preview/index.html.erb
	<html>
	<head>
	<title>Email Previews</title>
	</head>
	<body>
	<ul>
	<%= for email <- @emails do %>
	<li><a href="<%= "/email_previews/#{to_string(email)}" %>"><%= email %></a></li>
	<% end %>
	</ul>
	</body>
	</html>

	# in lib/my_app_web/templates/email_preview/show.html.erb
	<div style="text-align:center">Subject: <strong><%= @email.subject %></strong></div>

	<%= raw(@email.html_body) %>