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 64 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
— 3
Tor Books 2
		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	✓
Ace 2
Orbit 1
		The Hidden Forest 1	Frank Herbert, Ted Chiang, and Ann Leckie	Nonfiction	28.24 €	Orbit	✗
Gollancz 1
		The Distant Door 26	Ann Leckie, Iain Banks, and Liu Cixin	Nonfiction	16.40 €	Gollancz	✓
DAW 3
		The Dispossessed Winter 29	Ted Chiang and Ann Leckie	Nonfiction	9.04 €	DAW	✓
		The Silent Station 60	Becky Chambers, Octavia Butler, and Margaret Atwood	Nonfiction	34.96 €	DAW	✗
		The Broken Station 61	Octavia Butler	Nonfiction	18.89 €	DAW	✗
Baen 4
		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 City 45	Ann Leckie, Kim Robinson, and Octavia Butler	Nonfiction	19.30 €	Baen	✗
Del Rey 3
		The Quiet Mirror 5	Kim Robinson, Liu Cixin, and Becky Chambers	Nonfiction	32.73 €	Del Rey	✓
		The Hidden Tower 47	Martha Wells	Nonfiction	19.92 €	Del Rey	✓
		The Dispossessed Empire 54	Margaret Atwood, Octavia Butler, and Stanisław Lem	Nonfiction	43.50 €	Del Rey	✓
Vintage 2