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
— 4
Tor Books 3
Ace 3
		The Distant Garden 34	Ted Chiang	Nonfiction	25.55 €	Ace	✓
		The Luminous Tower 88	Frank Herbert, Liu Cixin, and Ursula Le Guin	Nonfiction	37.25 €	Ace	✓
		The Ancient Archive 114	Frank Herbert, Kim Robinson, and Margaret Atwood	Nonfiction	44.21 €	Ace	✓
Orbit 1
		The Hidden Door 106	Martha Wells, Mary Shelley, and Stanisław Lem	Nonfiction	19.30 €	Orbit	✓
Gollancz 3
DAW 5
Baen 5
Del Rey 5
		The Quiet Mirror 5	Kim Robinson, Liu Cixin, and Becky Chambers	Nonfiction	32.73 €	Del Rey	✓
		The Hidden Tower 47	Martha Wells	Nonfiction	19.92 €	Del Rey	✓
		The Dispossessed Empire 54	Margaret Atwood, Octavia Butler, and Stanisław Lem	Nonfiction	43.50 €	Del Rey	✓
		The Burning Forest 81	Ted Chiang, Becky Chambers, and Liu Cixin	Nonfiction	6.28 €	Del Rey	✓
		The Hidden Winter 92	Margaret Atwood, Octavia Butler, and Iain Banks	Nonfiction	29.93 €	Del Rey	✓
Vintage 1