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
— 2
		The Broken Empire 69	Ted Chiang	Nonfiction	29.21 €	—	✓
		The Endless Garden 99	Martha Wells and Kim Robinson	Nonfiction	17.29 €	—	✓
Tor Books 4
Ace 2
Orbit 6
		The Hidden Forest 1	Frank Herbert, Ted Chiang, and Ann Leckie	Nonfiction	28.24 €	Orbit	✗
		The Broken Garden 6	Stanisław Lem, Ursula Le Guin, and Iain Banks	Nonfiction	19.85 €	Orbit	✓
		The Endless Garden 15	Ursula Le Guin, Joe Abercrombie, and Adrian Tchaikovsky	Nonfiction	29.85 €	Orbit	✓
		The Hidden Dune 21	Octavia Butler	Nonfiction	16.41 €	Orbit	✓
		The Silent Machine 49	Iain Banks	Nonfiction	20.70 €	Orbit	✓
		The Distant Door 119	Ted Chiang and Kim Robinson	Nonfiction	29.94 €	Orbit	✓
Gollancz 3
DAW 4
Baen 2
		The Endless Tower 30	Liu Cixin, Ted Chiang, and Becky Chambers	Nonfiction	38.98 €	Baen	✓
		The Ancient Mirror 56	Stanisław Lem and Joe Abercrombie	Nonfiction	37.08 €	Baen	✓
Del Rey 3
		The Dispossessed Winter 24	Ted Chiang	Nonfiction	19.40 €	Del Rey	✗
		The Dispossessed Engine 74	Adrian Tchaikovsky, Margaret Atwood, and Becky Chambers	Nonfiction	39.15 €	Del Rey	✓
		The Distant Engine 80	Joe Abercrombie, Iain Banks, and Ann Leckie	Nonfiction	43.18 €	Del Rey	✗
Vintage 7