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

— 19
Tor Books 11
Ace 16
Orbit 9
		The Hidden Forest 1	Frank Herbert, Ted Chiang, and Ann Leckie	Nonfiction	28.24 €	Orbit	✗
		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 Broken Empire 48	Ted Chiang and Ann Leckie	Fiction	30.49 €	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	✓
		The Luminous Ocean 108	Ted Chiang	Nonfiction	39.89 €	Orbit	✗
Gollancz 11
DAW 19
Baen 8
Del Rey 12
Vintage 15