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
The Endless Door 35 Martha Wells Nonfiction 24.06 € — ✓
The Luminous Machine 41 Ursula Le Guin Nonfiction 23.63 € — ✓
The Endless Station 55 Ann Leckie, Frank Herbert, and Joe Abercrombie Nonfiction 20.24 € — ✓
The Ancient Engine 80 Martha Wells and Kim Robinson Nonfiction 17.29 € — ✓
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
Orbit 1
The Hidden Door 106 Martha Wells, Mary Shelley, and Stanisław Lem Nonfiction 19.30 € Orbit ✓
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
Baen 5
The Dispossessed Station 12 Martha Wells and Ann Leckie Nonfiction 16.58 € Baen ✓
The Burning Door 36 Kim Robinson Nonfiction 31.42 € Baen ✓
The Silent Tower 39 Ann Leckie, Mary Shelley, and Ursula Le Guin Nonfiction 25.60 € Baen ✓
The Luminous Forest 68 Liu Cixin, Ann Leckie, and Ursula Le Guin Nonfiction 40.60 € Baen ✓
The Burning Station 110 Mary Shelley Nonfiction 24.38 € Baen ✓
Del Rey 5
Vintage 1