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 3
Orbit 1
		The Hidden Door 106	Martha Wells, Mary Shelley, and Stanisław Lem	Nonfiction	19.30 €	Orbit	✓
Gollancz 3
DAW 5
Baen 5
		The Dispossessed Station 12	Martha Wells and Ann Leckie	Nonfiction	16.58 €	Baen	✓
		The Burning Door 36	Kim Robinson	Nonfiction	31.42 €	Baen	✓
		The Silent Tower 39	Ann Leckie, Mary Shelley, and Ursula Le Guin	Nonfiction	25.60 €	Baen	✓
		The Luminous Forest 68	Liu Cixin, Ann Leckie, and Ursula Le Guin	Nonfiction	40.60 €	Baen	✓
		The Burning Station 110	Mary Shelley	Nonfiction	24.38 €	Baen	✓
Del Rey 5
Vintage 1