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
— 6
		The Burning Winter 6	Octavia Butler	Scifi	21.78 €	—	✓
		The Endless Station 11	Joe Abercrombie	Scifi	10.86 €	—	✓
		The Ancient Engine 71	Becky Chambers	Scifi	32.68 €	—	✓
		The Dispossessed Empire 89	Kim Robinson and Joe Abercrombie	Scifi	11.61 €	—	✓
		The Hidden Door 107	Iain Banks and Mary Shelley	Scifi	17.84 €	—	✓
		The Endless Empire 117	Becky Chambers and Ted Chiang	Scifi	29.30 €	—	✓
Tor Books 2
		The Hidden Station 44	Margaret Atwood, Martha Wells, and Becky Chambers	Scifi	12.11 €	Tor Books	✓
		The Quiet Door 87	Ted Chiang	Scifi	35.06 €	Tor Books	✓
Ace 6
Orbit 2
		The Hidden Winter 32	Kim Robinson, Stanisław Lem, and Margaret Atwood	Scifi	40.79 €	Orbit	✓
		The Ancient Forest 56	Iain Banks, Ursula Le Guin, and Kim Robinson	Scifi	33.64 €	Orbit	✓
Gollancz 3
DAW 5
Baen 2
Del Rey 3
		The Endless Forest 15	Octavia Butler, Ann Leckie, and Liu Cixin	Scifi	11.84 €	Del Rey	✓
		The Endless Signal 73	Frank Herbert, Iain Banks, and Margaret Atwood	Scifi	19.39 €	Del Rey	✓
		The Distant Engine 83	Martha Wells, Liu Cixin, and Ursula Le Guin	Scifi	39.52 €	Del Rey	✓
Vintage 5