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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— 6
The Burning Winter 6 Octavia Butler Scifi 21.78 € — ✓
The Endless Station 11 Joe Abercrombie Scifi 10.86 € — ✓
The Ancient Engine 71 Becky Chambers Scifi 32.68 € — ✓
The Dispossessed Empire 89 Kim Robinson and Joe Abercrombie Scifi 11.61 € — ✓
The Hidden Door 107 Iain Banks and Mary Shelley Scifi 17.84 € — ✓
The Endless Empire 117 Becky Chambers and Ted Chiang Scifi 29.30 € — ✓
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
Gollancz 3
DAW 5
Baen 2
Del Rey 3
Vintage 5