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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— 8
The Dispossessed City 4 Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky Fiction 19.95 € — ✓
The Hidden Archive 22 Becky Chambers, Mary Shelley, and Frank Herbert Fiction 23.21 € — ✓
The Distant Garden 52 Joe Abercrombie and Ursula Le Guin Fiction 36.80 € — ✓
The Dispossessed Forest 64 Liu Cixin Fiction 36.11 € — ✓
The Burning Archive 100 Joe Abercrombie Fiction 24.48 € — ✗
The Broken Forest 104 Octavia Butler and Frank Herbert Fiction 17.49 € — ✓
The Silent Engine 115 Octavia Butler, Margaret Atwood, and Ursula Le Guin Fiction 24.38 € — ✗
The Silent Archive 116 Ted Chiang and Joe Abercrombie Fiction 10.28 € — ✓
Tor Books 6
Ace 5
The Quiet Forest 8 Becky Chambers Fiction 11.98 € Ace ✗
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 ✓
The Dispossessed Door 103 Iain Banks and Frank Herbert Fiction 30.10 € Ace ✗
Orbit 4
Gollancz 4
The Broken Engine 9 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 32.99 € Gollancz ✗
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 6
The Ancient Winter 3 Joe Abercrombie Fiction 24.81 € DAW ✗
The Endless Station 13 Ann Leckie, Martha Wells, and Ursula Le Guin Fiction 27.05 € DAW ✗
The Ancient Forest 93 Liu Cixin and Kim Robinson Fiction 41.21 € DAW ✓
The Hidden Garden 99 Frank Herbert Fiction 24.11 € DAW ✓
The Burning Empire 118 Kim Robinson, Mary Shelley, and Margaret Atwood Fiction 17.01 € DAW ✗
The Ancient Archive 119 Octavia Butler and Mary Shelley Fiction 21.49 € DAW ✗
Del Rey 2
Vintage 8