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 %>

Read more: Grouping

Cover Title Author names Genre Price Publisher Active
Fiction 45
The Broken Engine 4 Liu Cixin, Ann Leckie, and Ursula Le Guin Fiction 12.63 € Vintage ✓
The Burning Machine 8 Margaret Atwood and Becky Chambers Fiction 38.02 € Del Rey ✓
The Ancient Tower 11 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 40.82 € Gollancz ✗
The Endless Machine 14 Ann Leckie, Ursula Le Guin, and Joe Abercrombie Fiction 8.37 € Gollancz ✓
The Hidden Garden 16 Joe Abercrombie, Ted Chiang, and Becky Chambers Fiction 30.44 € Tor Books ✓
The Ancient Ocean 17 Martha Wells, Ted Chiang, and Stanisław Lem Fiction 34.01 € Baen ✓
The Ancient Ocean 19 Frank Herbert Fiction 43.54 € Baen ✓
The Hidden Door 22 Frank Herbert Fiction 30.21 € Baen ✓
The Burning Door 23 Ann Leckie and Martha Wells Fiction 15.15 € Gollancz ✓
The Luminous Ocean 25 Margaret Atwood Fiction 37.67 € DAW ✓
The Endless Dune 26 Ursula Le Guin and Joe Abercrombie Fiction 26.43 € — ✓
The Quiet Machine 31 Margaret Atwood Fiction 21.83 € Tor Books ✓
The Ancient Engine 32 Octavia Butler Fiction 33.11 € Tor Books ✓
The Ancient Door 34 Margaret Atwood and Mary Shelley Fiction 32.79 € Ace ✓
The Hidden Mirror 35 Ann Leckie Fiction 27.24 € Ace ✓
The Hidden Forest 40 Martha Wells, Joe Abercrombie, and Mary Shelley Fiction 37.54 € Orbit ✓
The Broken Empire 43 Ursula Le Guin Fiction 20.31 € Del Rey ✓
The Endless Station 47 Joe Abercrombie and Kim Robinson Fiction 26.37 € Tor Books ✓
The Ancient City 52 Margaret Atwood Fiction 17.77 € Gollancz ✓
The Broken Machine 61 Ann Leckie Fiction 30.16 € Orbit ✓
The Broken Dune 63 Liu Cixin and Mary Shelley Fiction 6.27 € Baen ✓
The Luminous Ocean 64 Becky Chambers and Stanisław Lem Fiction 33.85 € Baen ✓
The Dispossessed Ocean 67 Martha Wells Fiction 40.62 € Tor Books ✗
The Ancient City 72 Stanisław Lem, Mary Shelley, and Frank Herbert Fiction 34.41 € Orbit ✓
The Silent City 75 Iain Banks and Octavia Butler Fiction 44.32 € Orbit ✓
The Silent Tower 78 Adrian Tchaikovsky Fiction 16.99 € Vintage ✓
The Endless Ocean 79 Liu Cixin Fiction 24.96 € — ✓
The Hidden Winter 82 Joe Abercrombie, Ann Leckie, and Mary Shelley Fiction 12.30 € Vintage ✓
The Hidden Signal 85 Becky Chambers, Liu Cixin, and Margaret Atwood Fiction 20.30 € Ace ✗
The Burning Station 87 Adrian Tchaikovsky and Joe Abercrombie Fiction 15.13 € DAW ✓
The Ancient Signal 88 Becky Chambers and Frank Herbert Fiction 19.15 € Baen ✓
The Hidden Door 95 Mary Shelley Fiction 21.22 € Baen ✓
The Broken Mirror 96 Stanisław Lem Fiction 34.38 € Vintage ✗
The Luminous Empire 97 Liu Cixin Fiction 13.61 € Baen ✓
The Ancient Engine 101 Adrian Tchaikovsky Fiction 37.89 € Vintage ✓
The Dispossessed Dune 102 Frank Herbert, Joe Abercrombie, and Mary Shelley Fiction 37.91 € — ✓
The Distant Dune 104 Becky Chambers and Iain Banks Fiction 25.09 € Ace ✓
The Distant Station 106 Frank Herbert and Mary Shelley Fiction 12.86 € Orbit ✓
The Broken Winter 108 Ted Chiang Fiction 32.73 € Vintage ✓
The Hidden Dune 110 Iain Banks, Joe Abercrombie, and Frank Herbert Fiction 40.26 € Orbit ✓
The Endless City 112 Ann Leckie and Stanisław Lem Fiction 23.04 € Vintage ✓
The Dispossessed Archive 114 Octavia Butler and Joe Abercrombie Fiction 8.47 € DAW ✓
The Quiet Dune 115 Ursula Le Guin Fiction 42.25 € — ✓
The Distant Winter 118 Joe Abercrombie Fiction 16.33 € Ace ✓
The Silent Winter 120 Iain Banks Fiction 16.22 € Del Rey ✓
Scifi 42
Nonfiction 33