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 55 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
		The Burning Winter 6	Octavia Butler	Scifi	21.78 €	—	✓
		The Endless Station 11	Joe Abercrombie	Scifi	10.86 €	—	✓
Tor Books 1
Ace 2
		The Burning Tower 20	Ann Leckie	Scifi	14.56 €	Ace	✓
		The Endless Winter 30	Octavia Butler	Scifi	39.19 €	Ace	✓
Orbit 1
Gollancz 1
DAW 4
		The Distant City 10	Stanisław Lem, Ted Chiang, and Liu Cixin	Scifi	26.91 €	DAW	✓
		The Hidden Engine 23	Stanisław Lem, Adrian Tchaikovsky, and Becky Chambers	Scifi	40.55 €	DAW	✗
		The Quiet City 27	Frank Herbert	Scifi	39.79 €	DAW	✓
		The Silent Archive 40	Ann Leckie	Scifi	41.43 €	DAW	✓
Del Rey 2
Vintage 2
		The Endless City 21	Ursula Le Guin, Frank Herbert, and Octavia Butler	Scifi	36.46 €	Vintage	✓
		The Broken Dune 49	Margaret Atwood and Mary Shelley	Scifi	22.90 €	Vintage	✓