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 %>

Read more: Grouping

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Cover Title Author names Genre Price Publisher Active
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— 7
Tor Books 2
Ace 6
The Burning Tower 20 Ann Leckie Scifi 14.56 € Ace ✓
The Endless Winter 30 Octavia Butler Scifi 39.19 € Ace ✓
The Luminous City 57 Adrian Tchaikovsky, Frank Herbert, and Margaret Atwood Scifi 23.17 € Ace ✓
The Broken Empire 58 Martha Wells Scifi 34.83 € Ace ✓
The Dispossessed Archive 82 Octavia Butler and Ted Chiang Scifi 35.72 € Ace ✓
The Hidden Tower 91 Adrian Tchaikovsky, Frank Herbert, and Kim Robinson Scifi 29.28 € Ace ✓
Orbit 2
The Hidden Winter 32 Kim Robinson, Stanisław Lem, and Margaret Atwood Scifi 40.79 € Orbit ✓
The Ancient Forest 56 Iain Banks, Ursula Le Guin, and Kim Robinson Scifi 33.64 € Orbit ✓
Gollancz 4
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 ✓