Grouped table

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

Grouping is a render-time arrangement, like the layout. Add group_by: :publisher — the gem orders by the group key, splits the rows into collapsible groups (chevron in the header) and shows a per-group count. With 120 books, groups start collapsed beyond config.group_collapse_threshold (default 50), opening only the first; the open ones live in ?open=, so a half-expanded view is copy-pasteable.

app/views/groups/index.html.erb

<%= crud_collection @books, group_by: :publisher %>   <%# belongs_to, enum or a column %>

Read more: Grouping

Reset
	Cover	Title	Author names	Genre	Price	Publisher	Active
								Reset
— 4
Tor Books 3
		The Broken Mirror 37	Margaret Atwood and Octavia Butler	Nonfiction	7.28 €	Tor Books	✓
		The Ancient Machine 51	Ann Leckie and Ursula Le Guin	Nonfiction	40.77 €	Tor Books	✓
		The Quiet Tower 90	Octavia Butler, Ted Chiang, and Margaret Atwood	Nonfiction	31.01 €	Tor Books	✓
Ace 5
Orbit 3
Gollancz 3
		The Distant Door 26	Ann Leckie, Iain Banks, and Liu Cixin	Nonfiction	16.40 €	Gollancz	✓
		The Ancient Ocean 74	Margaret Atwood	Nonfiction	14.70 €	Gollancz	✓
		The Broken City 102	Ann Leckie, Margaret Atwood, and Frank Herbert	Nonfiction	40.54 €	Gollancz	✓
DAW 7
Baen 6
Del Rey 6
Vintage 2
		The Endless Mirror 2	Ann Leckie, Mary Shelley, and Ursula Le Guin	Nonfiction	28.63 €	Vintage	✓
		The Quiet Dune 62	Mary Shelley	Nonfiction	24.14 €	Vintage	✗