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
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
		The Burning City 27	Ann Leckie	Nonfiction	29.92 €	DAW	✓
		The Silent Door 29	Iain Banks	Nonfiction	38.24 €	DAW	✓
		The Broken Door 100	Stanisław Lem	Nonfiction	26.98 €	DAW	✓
		The Luminous City 105	Liu Cixin, Stanisław Lem, and Iain Banks	Nonfiction	22.63 €	DAW	✓
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
Vintage 7