user_session_live.ex

defmodule ProjectWeb.UserSessionLive do
  use ProjectWeb, :live_view

  alias Project.Accounts

  def mount(_params, _session, socket) do
    {:ok,
     assign(socket,
       email_input_error: nil,
       email: nil
     )}
  end

  def handle_event("login", %{"user" => %{"email" => email}}, socket) do
    Accounts.get_user_by_email(email)
    |> handle_login_response(socket)
  end

  defp handle_login_response(%Accounts.User{} = user, socket)do
    Accounts.send_access_code(user.email)
    {:noreply, assign(socket, %{email: user.email, email_input_error: nil})}
  end

  defp handle_login_response(_user, socket),
    do: {:noreply, assign(socket, :email_input_error, "E-mail not found")}
end