Programming Phoenix LiveView B9.0: "The Promo Live View" section does not work without modification when using Phoenix ~> 1.7.3 and LiveView ~> 0.19.0 (p. 130)

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OK, I whipped up an implementation based on some of the examples found in the generated code created while I was working on the project. I don’t know if it’s better. All I know is that it works, it matches the style of the generated code (which I assume is reasonably relevant), and it matches the info I found on this LiveView docs page that I referenced in my original post.

lib/pento_web/live/promo_live.ex
defmodule PentoWeb.PromoLive do
  use PentoWeb, :live_view
  alias Pento.Promo
  alias Pento.Promo.Recipient

  @impl true
  def mount(_params, _session, socket) do
    changeset = Promo.change_recipient(%Recipient{})

    {:ok, socket |> assign_form(changeset)}
  end

  defp assign_form(socket, %Ecto.Changeset{} = changeset) do
    assign(socket, :form, to_form(changeset))
  end

  @impl true
  def handle_event("validate", %{"recipient" => recipient_params}, socket) do
    changeset = %Recipient{}
      |> Promo.change_recipient(recipient_params)
      |> Map.put(:action, :validate)

    {:noreply, assign_form(socket, changeset)}
  end

  def handle_event("save", %{"recipient" => recipient_params}, socket) do
    changeset = %Recipient{}
      |> Promo.change_recipient(recipient_params)

    if changeset.valid? do
      {:noreply, socket |> put_flash(:info, "Form submitted successfully.")}
    else
      {:noreply,
       socket
       |> put_flash(:error, "Please fill out the form correctly before continuing.")}
    end
  end
end
lib/pento_web/live/promo_live.html.heex
<.header>
  Send Your Promo Code to a Friend
  <:subtitle>promo code for 10% off their first game purchase!</:subtitle>
</.header>

<.simple_form
  for={@form}
  id="promo-form"
  phx-change="validate"
  phx-submit="save"
>
  <.input field={@form[:first_name]} type="text" label="First name" />
  <.input field={@form[:email]} type="email" label="Email address" phx-debounce="blur" />

  <:actions>
    <.button phx-disable-with="Sending...">Send Promo</.button>
  </:actions>
</.simple_form>
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