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
— 10
Tor Books 11
Ace 12
Orbit 13
Gollancz 9
		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	✓
DAW 14
Baen 10
Del Rey 11
		The Burning Machine 8	Margaret Atwood and Becky Chambers	Fiction	38.02 €	Del Rey	✓
		The Broken Dune 10	Liu Cixin, Margaret Atwood, and Martha Wells	Scifi	13.54 €	Del Rey	✓
		The Endless Forest 18	Octavia Butler, Ann Leckie, and Liu Cixin	Scifi	11.84 €	Del Rey	✓
		The Distant Station 28	Liu Cixin	Scifi	15.62 €	Del Rey	✓
		The Broken Empire 43	Ursula Le Guin	Fiction	20.31 €	Del Rey	✓
		The Silent Signal 57	Frank Herbert	Scifi	24.90 €	Del Rey	✓
		The Silent Signal 71	Margaret Atwood, Ursula Le Guin, and Iain Banks	Scifi	35.42 €	Del Rey	✓
		The Dispossessed Engine 74	Adrian Tchaikovsky, Margaret Atwood, and Becky Chambers	Nonfiction	39.15 €	Del Rey	✓
		The Quiet Forest 81	Kim Robinson and Joe Abercrombie	Scifi	37.94 €	Del Rey	✓
		The Quiet Signal 91	Kim Robinson	Scifi	9.09 €	Del Rey	✓
		The Silent Winter 120	Iain Banks	Fiction	16.22 €	Del Rey	✓
Vintage 15
		The Endless Mirror 2	Ann Leckie, Mary Shelley, and Ursula Le Guin	Nonfiction	28.63 €	Vintage	✓
		The Silent Tower 3	Stanisław Lem and Martha Wells	Scifi	43.93 €	Vintage	✓
		The Broken Engine 4	Liu Cixin, Ann Leckie, and Ursula Le Guin	Fiction	12.63 €	Vintage	✓
		The Endless Empire 5	Ann Leckie	Nonfiction	25.88 €	Vintage	✓
		The Ancient Ocean 44	Becky Chambers	Nonfiction	25.72 €	Vintage	✓
		The Luminous City 45	Kim Robinson, Stanisław Lem, and Ann Leckie	Scifi	40.14 €	Vintage	✓
		The Dispossessed Station 58	Joe Abercrombie, Ursula Le Guin, and Iain Banks	Scifi	22.59 €	Vintage	✓
		The Silent Mirror 60	Ann Leckie and Kim Robinson	Nonfiction	25.07 €	Vintage	✓
		The Hidden Station 66	Octavia Butler and Iain Banks	Scifi	40.83 €	Vintage	✓
		The Distant Station 77	Iain Banks	Scifi	38.94 €	Vintage	✓
		The Silent Tower 78	Adrian Tchaikovsky	Fiction	16.99 €	Vintage	✓
		The Hidden Winter 82	Joe Abercrombie, Ann Leckie, and Mary Shelley	Fiction	12.30 €	Vintage	✓
		The Ancient Engine 101	Adrian Tchaikovsky	Fiction	37.89 €	Vintage	✓
		The Broken Winter 108	Ted Chiang	Fiction	32.73 €	Vintage	✓
		The Endless City 112	Ann Leckie and Stanisław Lem	Fiction	23.04 €	Vintage	✓