Syntax Pipe comparison

def create(conn, %{"posting" => posting_params}) do
  posting_params = posting_params
                     |> extract_valid_params
                     |> to_create_params(conn)
  changeset = Posting.changeset(%Posting{}, posting_params)

  if changeset.valid? do
    posting = Repo.insert!(changeset)
    posting |> Publisher.after_create

    conn
      |> put_session(:created_posting_uid, posting.uid)
      |> redirect(to: posting_path(conn, :index))
  else
    render(conn, "new.html", changeset: changeset)
  end
end

def create(conn, %{"posting" => posting_params}) do
  posting_params = posting_params
                   |> extract_valid_params
                   |> to_create_params(conn)
  changeset = Posting.changeset(%Posting{}, posting_params)

  if changeset.valid? do
    posting = Repo.insert!(changeset)
    posting |> Publisher.after_create

    conn
    |> put_session(:created_posting_uid, posting.uid)
    |> redirect(to: posting_path(conn, :index))
  else
    render(conn, "new.html", changeset: changeset)
  end
end