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
Tor Books 3
Ace 1
Orbit 5
		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
		The Hidden Engine 13	Margaret Atwood and Frank Herbert	Nonfiction	33.63 €	Gollancz	✓
		The Ancient Tower 54	Margaret Atwood	Nonfiction	27.65 €	Gollancz	✓
		The Ancient Winter 111	Ursula Le Guin	Nonfiction	11.99 €	Gollancz	✓
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 1
Vintage 4