Preview: The Hidden Engine 13

How this page is built the gem renders it — this is all you write

A custom member action. Its path is derived from the conventional preview_book_path route, and it self-disables if that route or permission is missing. The page renders whatever you like — here a compact record view with actions off.

app/models/book.rb

action :preview, icon: 'eye'   # member action → preview_book_path

app/views/books/preview.html.erb

<%= crud_record @book, fieldset: :compact, actions: false %>