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

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	Cover	Title	Author names	Genre	Price	Publisher	Active
								Reset
— 4
Tor Books 5
Ace 5
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
		The Ancient Tower 11	Ted Chiang, Ann Leckie, and Frank Herbert	Fiction	40.82 €	Gollancz	✗
		The Endless Machine 14	Ann Leckie, Ursula Le Guin, and Joe Abercrombie	Fiction	8.37 €	Gollancz	✓
		The Burning Door 23	Ann Leckie and Martha Wells	Fiction	15.15 €	Gollancz	✓
		The Ancient City 52	Margaret Atwood	Fiction	17.77 €	Gollancz	✓
DAW 3
Baen 8
Del Rey 3
Vintage 7