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: :genre — 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: :genre %>   <%# belongs_to, enum or a column %>

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Cover Title Author names Genre Price Publisher Active
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Fiction 33
The Dispossessed City 4 Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky Fiction 19.95 € — ✓
The Dispossessed City 7 Liu Cixin, Octavia Butler, and Kim Robinson Fiction 17.82 € Vintage ✓
The Endless Dune 17 Joe Abercrombie, Mary Shelley, and Stanisław Lem Fiction 18.69 € Tor Books ✓
The Hidden Mirror 19 Joe Abercrombie, Ursula Le Guin, and Adrian Tchaikovsky Fiction 37.51 € Vintage ✓
The Hidden Archive 22 Becky Chambers, Mary Shelley, and Frank Herbert Fiction 23.21 € — ✓
The Ancient Mirror 24 Mary Shelley Fiction 33.42 € Gollancz ✓
The Endless Winter 25 Ann Leckie Fiction 41.02 € Del Rey ✓
The Endless Winter 28 Iain Banks, Liu Cixin, and Ted Chiang Fiction 29.97 € Tor Books ✓
The Hidden Engine 31 Becky Chambers, Mary Shelley, and Stanisław Lem Fiction 32.85 € Vintage ✓
The Endless Signal 33 Adrian Tchaikovsky Fiction 39.74 € Ace ✓
The Distant Forest 38 Adrian Tchaikovsky and Octavia Butler Fiction 38.71 € Tor Books ✓
The Ancient Garden 42 Iain Banks Fiction 35.86 € Tor Books ✓
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 Burning Station 50 Ursula Le Guin and Octavia Butler Fiction 14.43 € Ace ✓
The Distant Garden 52 Joe Abercrombie and Ursula Le Guin Fiction 36.80 € — ✓
The Ancient Ocean 53 Martha Wells and Ursula Le Guin Fiction 25.74 € Del Rey ✓
The Quiet Empire 59 Kim Robinson, Liu Cixin, and Ted Chiang Fiction 39.87 € Vintage ✓
The Dispossessed Forest 64 Liu Cixin Fiction 36.11 € — ✓
The Ancient Dune 67 Mary Shelley and Ann Leckie Fiction 38.41 € Tor Books ✓
The Luminous Engine 76 Mary Shelley Fiction 34.79 € Ace ✓
The Hidden Dune 79 Martha Wells and Ursula Le Guin Fiction 24.25 € Gollancz ✓
The Distant Station 86 Frank Herbert and Mary Shelley Fiction 12.86 € Orbit ✓
The Ancient Forest 93 Liu Cixin and Kim Robinson Fiction 41.21 € DAW ✓
The Luminous Station 94 Adrian Tchaikovsky and Mary Shelley Fiction 26.90 € Vintage ✓
The Quiet Station 95 Adrian Tchaikovsky, Ursula Le Guin, and Stanisław Lem Fiction 6.29 € Tor Books ✓
The Distant Winter 96 Martha Wells and Becky Chambers Fiction 10.36 € Gollancz ✓
The Hidden Garden 99 Frank Herbert Fiction 24.11 € DAW ✓
The Dispossessed Ocean 101 Ann Leckie Fiction 12.58 € Vintage ✓
The Broken Forest 104 Octavia Butler and Frank Herbert Fiction 17.49 € — ✓
The Hidden Garden 109 Ted Chiang Fiction 22.95 € Vintage ✓
The Quiet Forest 113 Adrian Tchaikovsky and Octavia Butler Fiction 33.56 € Vintage ✓
The Silent Archive 116 Ted Chiang and Joe Abercrombie Fiction 10.28 € — ✓
Scifi 34
Nonfiction 30