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 8
		The Endless Winter 37	Octavia Butler	Scifi	39.19 €	Ace	✓
		The Hidden Machine 38	Joe Abercrombie and Ann Leckie	Scifi	38.74 €	Ace	✓
		The Silent Forest 59	Stanisław Lem	Scifi	14.46 €	Ace	✓
		The Luminous Garden 65	Liu Cixin and Ursula Le Guin	Scifi	6.67 €	Ace	✓
		The Luminous Mirror 70	Adrian Tchaikovsky, Frank Herbert, and Margaret Atwood	Scifi	8.90 €	Ace	✓
		The Dispossessed Winter 73	Adrian Tchaikovsky and Iain Banks	Scifi	29.24 €	Ace	✗
		The Burning Signal 83	Frank Herbert	Scifi	42.17 €	Ace	✓
		The Luminous Empire 93	Ann Leckie	Scifi	14.02 €	Ace	✓
Orbit 2
Gollancz 4
DAW 8
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	✓