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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— 4
The Burning Machine 7 Octavia Butler Scifi 10.40 € — ✓
The Endless Empire 41 Kim Robinson and Ted Chiang Scifi 30.81 € — ✓
The Distant Dune 86 Adrian Tchaikovsky and Stanisław Lem Scifi 41.33 € — ✓
The Luminous Empire 113 Ted Chiang, Mary Shelley, and Kim Robinson Scifi 31.61 € — ✓
Tor Books 4
Ace 8
Orbit 2
The Hidden Dune 9 Iain Banks Scifi 42.43 € Orbit ✓
The Distant Station 94 Joe Abercrombie Scifi 19.41 € Orbit ✓
Gollancz 4
DAW 8
The Endless Mirror 20 Stanisław Lem and Ted Chiang Scifi 21.82 € DAW ✓
The Endless Mirror 33 Frank Herbert Scifi 39.79 € DAW ✓
The Dispossessed Engine 36 Kim Robinson and Mary Shelley Scifi 23.93 € DAW ✓
The Broken Engine 46 Ted Chiang and Octavia Butler Scifi 5.74 € DAW ✓
The Broken Door 53 Adrian Tchaikovsky, Ted Chiang, and Margaret Atwood Scifi 33.91 € DAW ✓
The Silent Forest 62 Frank Herbert, Liu Cixin, and Stanisław Lem Scifi 35.70 € DAW ✓
The Endless Ocean 92 Liu Cixin Scifi 42.02 € DAW ✓
The Hidden Archive 98 Martha Wells and Ursula Le Guin Scifi 27.03 € DAW ✗
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 ✓