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

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	Cover	Title	Author names	Genre	Price	Publisher	Active
								Reset
— 16
Tor Books 11
Ace 12
Orbit 6
		The Hidden Winter 32	Kim Robinson, Stanisław Lem, and Margaret Atwood	Scifi	40.79 €	Orbit	✓
		The Ancient Garden 43	Frank Herbert, Iain Banks, and Becky Chambers	Fiction	42.67 €	Orbit	✓
		The Distant Engine 46	Margaret Atwood and Ted Chiang	Fiction	21.25 €	Orbit	✓
		The Ancient Forest 56	Iain Banks, Ursula Le Guin, and Kim Robinson	Scifi	33.64 €	Orbit	✓
		The Distant Station 86	Frank Herbert and Mary Shelley	Fiction	12.86 €	Orbit	✓
		The Hidden Door 106	Martha Wells, Mary Shelley, and Stanisław Lem	Nonfiction	19.30 €	Orbit	✓
Gollancz 9
		The Ancient Mirror 24	Mary Shelley	Fiction	33.42 €	Gollancz	✓
		The Distant Door 26	Ann Leckie, Iain Banks, and Liu Cixin	Nonfiction	16.40 €	Gollancz	✓
		The Silent Station 70	Octavia Butler	Scifi	34.46 €	Gollancz	✓
		The Distant Dune 72	Octavia Butler and Margaret Atwood	Scifi	32.20 €	Gollancz	✓
		The Ancient Ocean 74	Margaret Atwood	Nonfiction	14.70 €	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	✓
		The Broken City 102	Ann Leckie, Margaret Atwood, and Frank Herbert	Nonfiction	40.54 €	Gollancz	✓
		The Dispossessed Signal 112	Ted Chiang and Frank Herbert	Scifi	38.73 €	Gollancz	✓
DAW 12
Baen 7
Del Rey 10
Vintage 14