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
		The Endless Door 35	Martha Wells	Nonfiction	24.06 €	—	✓
		The Luminous Machine 41	Ursula Le Guin	Nonfiction	23.63 €	—	✓
		The Endless Station 55	Ann Leckie, Frank Herbert, and Joe Abercrombie	Nonfiction	20.24 €	—	✓
		The Ancient Engine 80	Martha Wells and Kim Robinson	Nonfiction	17.29 €	—	✓
Tor Books 3
Ace 5
		The Hidden Mirror 14	Ursula Le Guin and Kim Robinson	Nonfiction	22.58 €	Ace	✗
		The Distant Garden 34	Ted Chiang	Nonfiction	25.55 €	Ace	✓
		The Luminous Mirror 84	Kim Robinson and Ann Leckie	Nonfiction	19.40 €	Ace	✗
		The Luminous Tower 88	Frank Herbert, Liu Cixin, and Ursula Le Guin	Nonfiction	37.25 €	Ace	✓
		The Ancient Archive 114	Frank Herbert, Kim Robinson, and Margaret Atwood	Nonfiction	44.21 €	Ace	✓
Orbit 3
Gollancz 3
DAW 7
Baen 6
Del Rey 6
Vintage 2