easy-going-rails/app/views/layouts/_notification.html.erb

<%= turbo_frame_tag :notification do %>
  <% if flash.count.positive? %>
    <div data-controller="flash-toast" 
            data-id="<%= flash.object_id %>" 
            data-alert="<%= flash.alert %>" 
            data-notice="<%= flash.notice %>">
    </div>
    <% flash.clear %>
  <% end %>
<% end %>