philomena/lib/philomena_web/controllers/topic/subscription_controller.ex

defmodule PhilomenaWeb.Topic.SubscriptionController do
  use PhilomenaWeb, :controller

  alias Philomena.Forums.Forum
  alias Philomena.Topics

  plug PhilomenaWeb.CanaryMapPlug, create: :show, delete: :show
  plug :load_and_authorize_resource, model: Forum, id_name: "forum_id", id_field: "short_name", persisted: true

  plug PhilomenaWeb.LoadTopicPlug, [show_hidden: true] when action in [:delete]
  plug PhilomenaWeb.LoadTopicPlug when action in [:create]

  def create(conn, _params) do
    topic = conn.assigns.topic
    user = conn.assigns.current_user

    case Topics.create_subscription(topic, user) do
      {:ok, _subscription} ->
        render(conn, "_subscription.html", forum: conn.assigns.forum, topic: topic, watching: true, layout: false)

      {:error, _changeset} ->
        render(conn, "_error.html", layout: false)
    end
  end

  def delete(conn, _params) do
    topic = conn.assigns.topic
    user = conn.assigns.current_user

    case Topics.delete_subscription(topic, user) do
      {:ok, _subscription} ->
        render(conn, "_subscription.html", forum: conn.assigns.forum, topic: topic, watching: false, layout: false)

      {:error, _changeset} ->
        render(conn, "_error.html", layout: false)
    end
  end
end