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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— 6
Tor Books 6
Ace 3
The Endless Signal 33 Adrian Tchaikovsky Fiction 39.74 € Ace ✓
The Burning Station 50 Ursula Le Guin and Octavia Butler Fiction 14.43 € Ace ✓
The Luminous Engine 76 Mary Shelley Fiction 34.79 € Ace ✓
Orbit 3
The Ancient Garden 43 Frank Herbert, Iain Banks, and Becky Chambers Fiction 42.67 € Orbit ✓
The Distant Engine 46 Margaret Atwood and Ted Chiang Fiction 21.25 € Orbit ✓
The Distant Station 86 Frank Herbert and Mary Shelley Fiction 12.86 € Orbit ✓
Gollancz 3
The Ancient Mirror 24 Mary Shelley Fiction 33.42 € Gollancz ✓
The Hidden Dune 79 Martha Wells and Ursula Le Guin Fiction 24.25 € Gollancz ✓
The Distant Winter 96 Martha Wells and Becky Chambers Fiction 10.36 € Gollancz ✓
DAW 2
The Ancient Forest 93 Liu Cixin and Kim Robinson Fiction 41.21 € DAW ✓
The Hidden Garden 99 Frank Herbert Fiction 24.11 € DAW ✓
Del Rey 2
Vintage 8