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
		The Endless Dune 26	Ursula Le Guin and Joe Abercrombie	Fiction	26.43 €	—	✓
		The Endless Ocean 79	Liu Cixin	Fiction	24.96 €	—	✓
		The Dispossessed Dune 102	Frank Herbert, Joe Abercrombie, and Mary Shelley	Fiction	37.91 €	—	✓
		The Quiet Dune 115	Ursula Le Guin	Fiction	42.25 €	—	✓
Tor Books 5
Ace 5
		The Ancient Door 34	Margaret Atwood and Mary Shelley	Fiction	32.79 €	Ace	✓
		The Hidden Mirror 35	Ann Leckie	Fiction	27.24 €	Ace	✓
		The Hidden Signal 85	Becky Chambers, Liu Cixin, and Margaret Atwood	Fiction	20.30 €	Ace	✗
		The Distant Dune 104	Becky Chambers and Iain Banks	Fiction	25.09 €	Ace	✓
		The Distant Winter 118	Joe Abercrombie	Fiction	16.33 €	Ace	✓
Orbit 6
		The Hidden Forest 40	Martha Wells, Joe Abercrombie, and Mary Shelley	Fiction	37.54 €	Orbit	✓
		The Broken Machine 61	Ann Leckie	Fiction	30.16 €	Orbit	✓
		The Ancient City 72	Stanisław Lem, Mary Shelley, and Frank Herbert	Fiction	34.41 €	Orbit	✓
		The Silent City 75	Iain Banks and Octavia Butler	Fiction	44.32 €	Orbit	✓
		The Distant Station 106	Frank Herbert and Mary Shelley	Fiction	12.86 €	Orbit	✓
		The Hidden Dune 110	Iain Banks, Joe Abercrombie, and Frank Herbert	Fiction	40.26 €	Orbit	✓
Gollancz 4
DAW 3
Baen 8
Del Rey 3
Vintage 7