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 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
The Endless Winter 37 Octavia Butler Scifi 39.19 € Ace ✓
The Hidden Machine 38 Joe Abercrombie and Ann Leckie Scifi 38.74 € Ace ✓
The Silent Forest 59 Stanisław Lem Scifi 14.46 € Ace ✓
The Luminous Garden 65 Liu Cixin and Ursula Le Guin Scifi 6.67 € Ace ✓
The Luminous Mirror 70 Adrian Tchaikovsky, Frank Herbert, and Margaret Atwood Scifi 8.90 € Ace ✓
The Dispossessed Winter 73 Adrian Tchaikovsky and Iain Banks Scifi 29.24 € Ace ✗
The Burning Signal 83 Frank Herbert Scifi 42.17 € Ace ✓
The Luminous Empire 93 Ann Leckie Scifi 14.02 € Ace ✓
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
Del Rey 7
Vintage 5