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
Scifi 42
The Silent Tower 3 Stanisław Lem and Martha Wells Scifi 43.93 € Vintage ✓
The Burning Machine 7 Octavia Butler Scifi 10.40 € — ✓
The Hidden Dune 9 Iain Banks Scifi 42.43 € Orbit ✓
The Broken Dune 10 Liu Cixin, Margaret Atwood, and Martha Wells Scifi 13.54 € Del Rey ✓
The Quiet Station 12 Joe Abercrombie Scifi 11.40 € Gollancz ✓
The Endless Forest 18 Octavia Butler, Ann Leckie, and Liu Cixin Scifi 11.84 € Del Rey ✓
The Endless Mirror 20 Stanisław Lem and Ted Chiang Scifi 21.82 € DAW ✓
The Distant Station 28 Liu Cixin Scifi 15.62 € Del Rey ✓
The Endless Mirror 33 Frank Herbert Scifi 39.79 € DAW ✓
The Dispossessed Engine 36 Kim Robinson and Mary Shelley Scifi 23.93 € DAW ✓
The Endless Winter 37 Octavia Butler Scifi 39.19 € Ace ✓
The Hidden Machine 38 Joe Abercrombie and Ann Leckie Scifi 38.74 € Ace ✓
The Endless Door 39 Joe Abercrombie Scifi 18.58 € Tor Books ✓
The Endless Empire 41 Kim Robinson and Ted Chiang Scifi 30.81 € — ✓
The Luminous City 45 Kim Robinson, Stanisław Lem, and Ann Leckie Scifi 40.14 € Vintage ✓
The Broken Engine 46 Ted Chiang and Octavia Butler Scifi 5.74 € DAW ✓
The Hidden Mirror 48 Adrian Tchaikovsky Scifi 21.19 € Tor Books ✓
The Broken Door 53 Adrian Tchaikovsky, Ted Chiang, and Margaret Atwood Scifi 33.91 € DAW ✓
The Broken Door 55 Stanisław Lem and Ted Chiang Scifi 36.00 € Gollancz ✓
The Silent Signal 57 Frank Herbert Scifi 24.90 € Del Rey ✓
The Dispossessed Station 58 Joe Abercrombie, Ursula Le Guin, and Iain Banks Scifi 22.59 € Vintage ✓
The Silent Forest 59 Stanisław Lem Scifi 14.46 € Ace ✓
The Silent Forest 62 Frank Herbert, Liu Cixin, and Stanisław Lem Scifi 35.70 € DAW ✓
The Luminous Garden 65 Liu Cixin and Ursula Le Guin Scifi 6.67 € Ace ✓
The Hidden Station 66 Octavia Butler and Iain Banks Scifi 40.83 € Vintage ✓
The Luminous Mirror 70 Adrian Tchaikovsky, Frank Herbert, and Margaret Atwood Scifi 8.90 € Ace ✓
The Silent Signal 71 Margaret Atwood, Ursula Le Guin, and Iain Banks Scifi 35.42 € Del Rey ✓
The Dispossessed Winter 73 Adrian Tchaikovsky and Iain Banks Scifi 29.24 € Ace ✗
The Distant Station 77 Iain Banks Scifi 38.94 € Vintage ✓
The Quiet Forest 81 Kim Robinson and Joe Abercrombie Scifi 37.94 € Del Rey ✓
The Burning Signal 83 Frank Herbert Scifi 42.17 € Ace ✓
The Distant Dune 86 Adrian Tchaikovsky and Stanisław Lem Scifi 41.33 € — ✓
The Dispossessed Tower 90 Mary Shelley and Liu Cixin Scifi 33.21 € Gollancz ✓
The Quiet Signal 91 Kim Robinson Scifi 9.09 € Del Rey ✓
The Endless Ocean 92 Liu Cixin Scifi 42.02 € DAW ✓
The Luminous Empire 93 Ann Leckie Scifi 14.02 € Ace ✓
The Distant Station 94 Joe Abercrombie Scifi 19.41 € Orbit ✓
The Hidden Archive 98 Martha Wells and Ursula Le Guin Scifi 27.03 € DAW ✗
The Hidden Station 109 Becky Chambers, Joe Abercrombie, and Ursula Le Guin Scifi 37.73 € Tor Books ✓
The Luminous Empire 113 Ted Chiang, Mary Shelley, and Kim Robinson Scifi 31.61 € — ✓
The Endless Station 116 Octavia Butler and Joe Abercrombie Scifi 7.61 € Tor Books ✓
The Endless Machine 117 Ted Chiang and Kim Robinson Scifi 14.47 € Gollancz ✗
Nonfiction 33
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 Endless Empire 5 Ann Leckie Nonfiction 25.88 € Vintage ✓
The Broken Garden 6 Stanisław Lem, Ursula Le Guin, and Iain Banks Nonfiction 19.85 € Orbit ✓
The Hidden Engine 13 Margaret Atwood and Frank Herbert Nonfiction 33.63 € Gollancz ✓
The Endless Garden 15 Ursula Le Guin, Joe Abercrombie, and Adrian Tchaikovsky Nonfiction 29.85 € Orbit ✓
The Hidden Dune 21 Octavia Butler Nonfiction 16.41 € Orbit ✓
The Dispossessed Winter 24 Ted Chiang Nonfiction 19.40 € Del Rey ✗
The Burning City 27 Ann Leckie Nonfiction 29.92 € DAW ✓
The Silent Door 29 Iain Banks Nonfiction 38.24 € DAW ✓
The Endless Tower 30 Liu Cixin, Ted Chiang, and Becky Chambers Nonfiction 38.98 € Baen ✓
The Broken Machine 42 Ted Chiang Nonfiction 25.55 € Ace ✓
The Ancient Ocean 44 Becky Chambers Nonfiction 25.72 € Vintage ✓
The Silent Machine 49 Iain Banks Nonfiction 20.70 € Orbit ✓
The Endless Signal 50 Mary Shelley, Ursula Le Guin, and Ted Chiang Nonfiction 26.36 € Tor Books ✓
The Dispossessed Door 51 Stanisław Lem and Becky Chambers Nonfiction 36.10 € Tor Books ✓
The Ancient Tower 54 Margaret Atwood Nonfiction 27.65 € Gollancz ✓
The Ancient Mirror 56 Stanisław Lem and Joe Abercrombie Nonfiction 37.08 € Baen ✓
The Silent Mirror 60 Ann Leckie and Kim Robinson Nonfiction 25.07 € Vintage ✓
The Broken Ocean 68 Kim Robinson and Stanisław Lem Nonfiction 6.07 € Tor Books ✗
The Broken Empire 69 Ted Chiang Nonfiction 29.21 € — ✓
The Dispossessed Engine 74 Adrian Tchaikovsky, Margaret Atwood, and Becky Chambers Nonfiction 39.15 € Del Rey ✓
The Quiet Dune 76 Mary Shelley Nonfiction 24.14 € Vintage ✗
The Distant Engine 80 Joe Abercrombie, Iain Banks, and Ann Leckie Nonfiction 43.18 € Del Rey ✗
The Endless Winter 84 Iain Banks Nonfiction 34.31 € Vintage ✗
The Luminous Tower 89 Joe Abercrombie, Liu Cixin, and Margaret Atwood Nonfiction 22.68 € Ace ✗
The Endless Garden 99 Martha Wells and Kim Robinson Nonfiction 17.29 € — ✓
The Broken Door 100 Stanisław Lem Nonfiction 26.98 € DAW ✓
The Burning Garden 103 Stanisław Lem and Iain Banks Nonfiction 38.50 € Tor Books ✓
The Luminous City 105 Liu Cixin, Stanisław Lem, and Iain Banks Nonfiction 22.63 € DAW ✓
The Silent Dune 107 Stanisław Lem and Octavia Butler Nonfiction 17.86 € Vintage ✗
The Ancient Winter 111 Ursula Le Guin Nonfiction 11.99 € Gollancz ✓
The Distant Door 119 Ted Chiang and Kim Robinson Nonfiction 29.94 € Orbit ✓