Bagaimana untuk melaksanakan forum komuniti dan fungsi perbincangan topik melalui rangka kerja Webman?

webman new forum_app
cd forum_app

{:phoenix, "~> 1.5"},
{:phoenix_html, "~> 2.14"},
{:phoenix_live_view, "~> 0.15"},
{:phoenix_pubsub, "~> 2.0"},
{:phoenix_ecto, "~> 4.1"},
{:ecto_sql, "~> 3.4"},
{:sqlite_ecto2, "~> 2.0"}

mix deps.get

mix ecto.create
mix phx.gen.html Accounts User users name:string email:string password_hash:string
mix ecto.migrate

mix phx.gen.html Forum Topic topics title:string content:string user_id:references:users
mix phx.gen.html Forum Comment comments content:string user_id:references:users topic_id:references:topics
mix ecto.migrate

scope "/forum", Forum do
  resources "/topics", TopicController
end

mix phx.server

def create(conn, %{"topic" => topic_params}) do
  user_id = conn.assigns.current_user.id
  changeset = Topic.changeset(%Topic{user_id: user_id}, topic_params)

  case Repo.insert(changeset) do
    {:ok, _topic} ->
      conn
      |> put_flash(:info, "Topic created successfully.")
      |> redirect(to: Routes.topic_index_path(conn, :index))
    {:error, changeset} ->
      render(conn, "new.html", changeset: changeset)
  end
end

def create(conn, %{"comment" => comment_params}) do
  user_id = conn.assigns.current_user.id
  changeset = Comment.changeset(%Comment{user_id: user_id}, comment_params)

  case Repo.insert(changeset) do
    {:ok, _comment} ->
      conn
      |> put_flash(:info, "Comment created successfully.")
      |> redirect(to: Routes.topic_path(conn, :show, topic_id))
    {:error, changeset} ->
      render(conn, "new.html", changeset: changeset)
  end
end