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 43
The Ancient Winter 3 Joe Abercrombie Fiction 24.81 € DAW ✗
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 Quiet Forest 8 Becky Chambers Fiction 11.98 € Ace ✗
The Broken Engine 9 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 32.99 € Gollancz ✗
The Endless Station 13 Ann Leckie, Martha Wells, and Ursula Le Guin Fiction 27.05 € DAW ✗
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 Broken Empire 48 Ted Chiang and Ann Leckie Fiction 30.49 € 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 Burning Archive 100 Joe Abercrombie Fiction 24.48 € — ✗
The Dispossessed Ocean 101 Ann Leckie Fiction 12.58 € Vintage ✓
The Dispossessed Door 103 Iain Banks and Frank Herbert Fiction 30.10 € Ace ✗
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 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 € — ✓
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 ✗
Scifi 38
Nonfiction 39
The Hidden Forest 1 Frank Herbert, Ted Chiang, and Ann Leckie Nonfiction 28.24 € Orbit ✗
The Endless Mirror 2 Ann Leckie, Mary Shelley, and Ursula Le Guin Nonfiction 28.63 € Vintage ✓
The Quiet Mirror 5 Kim Robinson, Liu Cixin, and Becky Chambers Nonfiction 32.73 € Del Rey ✓
The Dispossessed Station 12 Martha Wells and Ann Leckie Nonfiction 16.58 € Baen ✓
The Hidden Mirror 14 Ursula Le Guin and Kim Robinson Nonfiction 22.58 € Ace ✗
The Distant Door 26 Ann Leckie, Iain Banks, and Liu Cixin Nonfiction 16.40 € Gollancz ✓
The Dispossessed Winter 29 Ted Chiang and Ann Leckie Nonfiction 9.04 € DAW ✓
The Distant Garden 34 Ted Chiang Nonfiction 25.55 € Ace ✓
The Endless Door 35 Martha Wells Nonfiction 24.06 € — ✓
The Burning Door 36 Kim Robinson Nonfiction 31.42 € Baen ✓
The Broken Mirror 37 Margaret Atwood and Octavia Butler Nonfiction 7.28 € Tor Books ✓
The Silent Tower 39 Ann Leckie, Mary Shelley, and Ursula Le Guin Nonfiction 25.60 € Baen ✓
The Luminous Machine 41 Ursula Le Guin Nonfiction 23.63 € — ✓
The Luminous City 45 Ann Leckie, Kim Robinson, and Octavia Butler Nonfiction 19.30 € Baen ✗
The Hidden Tower 47 Martha Wells Nonfiction 19.92 € Del Rey ✓
The Ancient Machine 51 Ann Leckie and Ursula Le Guin Nonfiction 40.77 € Tor Books ✓
The Dispossessed Empire 54 Margaret Atwood, Octavia Butler, and Stanisław Lem Nonfiction 43.50 € Del Rey ✓
The Endless Station 55 Ann Leckie, Frank Herbert, and Joe Abercrombie Nonfiction 20.24 € — ✓
The Silent Station 60 Becky Chambers, Octavia Butler, and Margaret Atwood Nonfiction 34.96 € DAW ✗
The Broken Station 61 Octavia Butler Nonfiction 18.89 € DAW ✗
The Quiet Dune 62 Mary Shelley Nonfiction 24.14 € Vintage ✗
The Hidden Ocean 65 Joe Abercrombie, Iain Banks, and Ann Leckie Nonfiction 43.18 € Del Rey ✗
The Luminous Forest 68 Liu Cixin, Ann Leckie, and Ursula Le Guin Nonfiction 40.60 € Baen ✓
The Ancient Ocean 74 Margaret Atwood Nonfiction 14.70 € Gollancz ✓
The Ancient Engine 80 Martha Wells and Kim Robinson Nonfiction 17.29 € — ✓
The Burning Forest 81 Ted Chiang, Becky Chambers, and Liu Cixin Nonfiction 6.28 € Del Rey ✓
The Luminous Mirror 84 Kim Robinson and Ann Leckie Nonfiction 19.40 € Ace ✗
The Luminous City 85 Liu Cixin, Stanisław Lem, and Iain Banks Nonfiction 22.63 € DAW ✓
The Luminous Tower 88 Frank Herbert, Liu Cixin, and Ursula Le Guin Nonfiction 37.25 € Ace ✓
The Quiet Tower 90 Octavia Butler, Ted Chiang, and Margaret Atwood Nonfiction 31.01 € Tor Books ✓
The Hidden Winter 92 Margaret Atwood, Octavia Butler, and Iain Banks Nonfiction 29.93 € Del Rey ✓
The Endless Engine 97 Becky Chambers Nonfiction 43.50 € DAW ✓
The Endless Mirror 98 Adrian Tchaikovsky, Martha Wells, and Ann Leckie Nonfiction 33.32 € DAW ✓
The Broken City 102 Ann Leckie, Margaret Atwood, and Frank Herbert Nonfiction 40.54 € Gollancz ✓
The Hidden Door 106 Martha Wells, Mary Shelley, and Stanisław Lem Nonfiction 19.30 € Orbit ✓
The Luminous Ocean 108 Ted Chiang Nonfiction 39.89 € Orbit ✗
The Burning Station 110 Mary Shelley Nonfiction 24.38 € Baen ✓
The Distant Archive 111 Frank Herbert Nonfiction 11.59 € DAW ✓
The Ancient Archive 114 Frank Herbert, Kim Robinson, and Margaret Atwood Nonfiction 44.21 € Ace ✓