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


	Cover	Title	Author names	Genre	Price	Publisher	Active

— 10
Tor Books 13
Ace 15
Orbit 14
Gollancz 11
		The Ancient Tower 11	Ted Chiang, Ann Leckie, and Frank Herbert	Fiction	40.82 €	Gollancz	✗
		The Quiet Station 12	Joe Abercrombie	Scifi	11.40 €	Gollancz	✓
		The Hidden Engine 13	Margaret Atwood and Frank Herbert	Nonfiction	33.63 €	Gollancz	✓
		The Endless Machine 14	Ann Leckie, Ursula Le Guin, and Joe Abercrombie	Fiction	8.37 €	Gollancz	✓
		The Burning Door 23	Ann Leckie and Martha Wells	Fiction	15.15 €	Gollancz	✓
		The Ancient City 52	Margaret Atwood	Fiction	17.77 €	Gollancz	✓
		The Ancient Tower 54	Margaret Atwood	Nonfiction	27.65 €	Gollancz	✓
		The Broken Door 55	Stanisław Lem and Ted Chiang	Scifi	36.00 €	Gollancz	✓
		The Dispossessed Tower 90	Mary Shelley and Liu Cixin	Scifi	33.21 €	Gollancz	✓
		The Ancient Winter 111	Ursula Le Guin	Nonfiction	11.99 €	Gollancz	✓
		The Endless Machine 117	Ted Chiang and Kim Robinson	Scifi	14.47 €	Gollancz	✗
DAW 15
Baen 10
Del Rey 13
Vintage 19