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
— 8
Tor Books 6
Ace 5
Orbit 4
Gollancz 4
		The Broken Engine 9	Ted Chiang, Ann Leckie, and Frank Herbert	Fiction	32.99 €	Gollancz	✗
		The Ancient Mirror 24	Mary Shelley	Fiction	33.42 €	Gollancz	✓
		The Hidden Dune 79	Martha Wells and Ursula Le Guin	Fiction	24.25 €	Gollancz	✓
		The Distant Winter 96	Martha Wells and Becky Chambers	Fiction	10.36 €	Gollancz	✓
DAW 6
Del Rey 2
		The Endless Winter 25	Ann Leckie	Fiction	41.02 €	Del Rey	✓
		The Ancient Ocean 53	Martha Wells and Ursula Le Guin	Fiction	25.74 €	Del Rey	✓
Vintage 8
		The Dispossessed City 7	Liu Cixin, Octavia Butler, and Kim Robinson	Fiction	17.82 €	Vintage	✓
		The Hidden Mirror 19	Joe Abercrombie, Ursula Le Guin, and Adrian Tchaikovsky	Fiction	37.51 €	Vintage	✓
		The Hidden Engine 31	Becky Chambers, Mary Shelley, and Stanisław Lem	Fiction	32.85 €	Vintage	✓
		The Quiet Empire 59	Kim Robinson, Liu Cixin, and Ted Chiang	Fiction	39.87 €	Vintage	✓
		The Luminous Station 94	Adrian Tchaikovsky and Mary Shelley	Fiction	26.90 €	Vintage	✓
		The Dispossessed Ocean 101	Ann Leckie	Fiction	12.58 €	Vintage	✓
		The Hidden Garden 109	Ted Chiang	Fiction	22.95 €	Vintage	✓
		The Quiet Forest 113	Adrian Tchaikovsky and Octavia Butler	Fiction	33.56 €	Vintage	✓