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
— 2
Tor Books 3
		The Endless Signal 50	Mary Shelley, Ursula Le Guin, and Ted Chiang	Nonfiction	26.36 €	Tor Books	✓
		The Dispossessed Door 51	Stanisław Lem and Becky Chambers	Nonfiction	36.10 €	Tor Books	✓
		The Burning Garden 103	Stanisław Lem and Iain Banks	Nonfiction	38.50 €	Tor Books	✓
Ace 1
		The Broken Machine 42	Ted Chiang	Nonfiction	25.55 €	Ace	✓
Orbit 5
Gollancz 3
DAW 4
		The Burning City 27	Ann Leckie	Nonfiction	29.92 €	DAW	✓
		The Silent Door 29	Iain Banks	Nonfiction	38.24 €	DAW	✓
		The Broken Door 100	Stanisław Lem	Nonfiction	26.98 €	DAW	✓
		The Luminous City 105	Liu Cixin, Stanisław Lem, and Iain Banks	Nonfiction	22.63 €	DAW	✓
Baen 2
		The Endless Tower 30	Liu Cixin, Ted Chiang, and Becky Chambers	Nonfiction	38.98 €	Baen	✓
		The Ancient Mirror 56	Stanisław Lem and Joe Abercrombie	Nonfiction	37.08 €	Baen	✓
Del Rey 1
Vintage 4