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
— 7
Tor Books 2
Ace 6
Orbit 2
Gollancz 4
		The Quiet Door 18	Becky Chambers	Scifi	21.79 €	Gollancz	✗
		The Silent Station 70	Octavia Butler	Scifi	34.46 €	Gollancz	✓
		The Distant Dune 72	Octavia Butler and Margaret Atwood	Scifi	32.20 €	Gollancz	✓
		The Dispossessed Signal 112	Ted Chiang and Frank Herbert	Scifi	38.73 €	Gollancz	✓
DAW 6
Baen 2
		The Distant Tower 63	Iain Banks, Liu Cixin, and Joe Abercrombie	Scifi	18.55 €	Baen	✓
		The Endless Ocean 105	Liu Cixin and Kim Robinson	Scifi	34.90 €	Baen	✓
Del Rey 4
Vintage 5
		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	✓
		The Endless City 69	Kim Robinson and Ursula Le Guin	Scifi	40.98 €	Vintage	✓
		The Hidden Tower 75	Frank Herbert	Scifi	5.34 €	Vintage	✓
		The Luminous Tower 77	Kim Robinson, Frank Herbert, and Joe Abercrombie	Scifi	28.81 €	Vintage	✓