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 4
Ace 7
Orbit 2
Gollancz 3
		The Quiet Station 12	Joe Abercrombie	Scifi	11.40 €	Gollancz	✓
		The Broken Door 55	Stanisław Lem and Ted Chiang	Scifi	36.00 €	Gollancz	✓
		The Dispossessed Tower 90	Mary Shelley and Liu Cixin	Scifi	33.21 €	Gollancz	✓
DAW 7
Del Rey 7
Vintage 5
		The Silent Tower 3	Stanisław Lem and Martha Wells	Scifi	43.93 €	Vintage	✓
		The Luminous City 45	Kim Robinson, Stanisław Lem, and Ann Leckie	Scifi	40.14 €	Vintage	✓
		The Dispossessed Station 58	Joe Abercrombie, Ursula Le Guin, and Iain Banks	Scifi	22.59 €	Vintage	✓
		The Hidden Station 66	Octavia Butler and Iain Banks	Scifi	40.83 €	Vintage	✓
		The Distant Station 77	Iain Banks	Scifi	38.94 €	Vintage	✓