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layout_inheritance

🔄 Fallback Content with provide and Default yield​

Use provide to set default values for content_for slots and then fallback to yield. If a view doesn’t override a section, the layout’s default will appear.

<!-- app/views/layouts/application.html.erb -->
<head>
  <title><%= content_for?(:title) ? yield(:title) : 'MyApp Default Title' %></title>
</head>
<body>
  <h1><%= yield(:title) || 'Welcome!' %></h1>
  <%= yield %>
</body>
</html>
<!-- in a view without title: app/views/home/index.html.erb -->
<p>This view doesn’t set a title, so layout defaults are used.</p>