Grouped table

Group by publisher Group by genre
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 %>

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Cover Title Author names Genre Price Publisher Active
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— 4
Tor Books 3
The Broken Mirror 37 Margaret Atwood and Octavia Butler Nonfiction 7.28 € Tor Books ✓
The Ancient Machine 51 Ann Leckie and Ursula Le Guin Nonfiction 40.77 € Tor Books ✓
The Quiet Tower 90 Octavia Butler, Ted Chiang, and Margaret Atwood Nonfiction 31.01 € Tor Books ✓
Ace 3
The Distant Garden 34 Ted Chiang Nonfiction 25.55 € Ace ✓
The Luminous Tower 88 Frank Herbert, Liu Cixin, and Ursula Le Guin Nonfiction 37.25 € Ace ✓
The Ancient Archive 114 Frank Herbert, Kim Robinson, and Margaret Atwood Nonfiction 44.21 € Ace ✓
Orbit 1
Gollancz 3
The Distant Door 26 Ann Leckie, Iain Banks, and Liu Cixin Nonfiction 16.40 € Gollancz ✓
The Ancient Ocean 74 Margaret Atwood Nonfiction 14.70 € Gollancz ✓
The Broken City 102 Ann Leckie, Margaret Atwood, and Frank Herbert Nonfiction 40.54 € Gollancz ✓
DAW 5
The Dispossessed Winter 29 Ted Chiang and Ann Leckie Nonfiction 9.04 € DAW ✓
The Luminous City 85 Liu Cixin, Stanisław Lem, and Iain Banks Nonfiction 22.63 € DAW ✓
The Endless Engine 97 Becky Chambers Nonfiction 43.50 € DAW ✓
The Endless Mirror 98 Adrian Tchaikovsky, Martha Wells, and Ann Leckie Nonfiction 33.32 € DAW ✓
The Distant Archive 111 Frank Herbert Nonfiction 11.59 € DAW ✓
Baen 5
Del Rey 5
Vintage 1