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

Cover Title Author names Genre Price Publisher Active
— 19
The Dispossessed City 4 Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky Fiction 19.95 € — ✓
The Burning Winter 6 Octavia Butler Scifi 21.78 € — ✓
The Endless Station 11 Joe Abercrombie Scifi 10.86 € — ✓
The Hidden Archive 22 Becky Chambers, Mary Shelley, and Frank Herbert Fiction 23.21 € — ✓
The Endless Door 35 Martha Wells Nonfiction 24.06 € — ✓
The Luminous Machine 41 Ursula Le Guin Nonfiction 23.63 € — ✓
The Distant Garden 52 Joe Abercrombie and Ursula Le Guin Fiction 36.80 € — ✓
The Endless Station 55 Ann Leckie, Frank Herbert, and Joe Abercrombie Nonfiction 20.24 € — ✓
The Dispossessed Forest 64 Liu Cixin Fiction 36.11 € — ✓
The Ancient Engine 71 Becky Chambers Scifi 32.68 € — ✓
The Hidden Engine 78 Iain Banks Scifi 8.00 € — ✗
The Ancient Engine 80 Martha Wells and Kim Robinson Nonfiction 17.29 € — ✓
The Dispossessed Empire 89 Kim Robinson and Joe Abercrombie Scifi 11.61 € — ✓
The Burning Archive 100 Joe Abercrombie Fiction 24.48 € — ✗
The Broken Forest 104 Octavia Butler and Frank Herbert Fiction 17.49 € — ✓
The Hidden Door 107 Iain Banks and Mary Shelley Scifi 17.84 € — ✓
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 Endless Empire 117 Becky Chambers and Ted Chiang Scifi 29.30 € — ✓
Tor Books 11
Ace 16
Orbit 9
Gollancz 11
The Broken Engine 9 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 32.99 € Gollancz ✗
The Quiet Door 18 Becky Chambers Scifi 21.79 € Gollancz ✗
The Ancient Mirror 24 Mary Shelley Fiction 33.42 € Gollancz ✓
The Distant Door 26 Ann Leckie, Iain Banks, and Liu Cixin Nonfiction 16.40 € Gollancz ✓
The Silent Station 70 Octavia Butler Scifi 34.46 € Gollancz ✓
The Distant Dune 72 Octavia Butler and Margaret Atwood Scifi 32.20 € Gollancz ✓
The Ancient Ocean 74 Margaret Atwood Nonfiction 14.70 € 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 ✓
The Broken City 102 Ann Leckie, Margaret Atwood, and Frank Herbert Nonfiction 40.54 € Gollancz ✓
The Dispossessed Signal 112 Ted Chiang and Frank Herbert Scifi 38.73 € Gollancz ✓
DAW 19
Baen 8
Del Rey 12
Vintage 15
The Endless Mirror 2 Ann Leckie, Mary Shelley, and Ursula Le Guin Nonfiction 28.63 € Vintage ✓
The Dispossessed City 7 Liu Cixin, Octavia Butler, and Kim Robinson Fiction 17.82 € Vintage ✓
The Hidden Mirror 19 Joe Abercrombie, Ursula Le Guin, and Adrian Tchaikovsky Fiction 37.51 € Vintage ✓
The Endless City 21 Ursula Le Guin, Frank Herbert, and Octavia Butler Scifi 36.46 € Vintage ✓
The Hidden Engine 31 Becky Chambers, Mary Shelley, and Stanisław Lem Fiction 32.85 € Vintage ✓
The Broken Dune 49 Margaret Atwood and Mary Shelley Scifi 22.90 € Vintage ✓
The Quiet Empire 59 Kim Robinson, Liu Cixin, and Ted Chiang Fiction 39.87 € Vintage ✓
The Quiet Dune 62 Mary Shelley Nonfiction 24.14 € Vintage ✗
The Endless City 69 Kim Robinson and Ursula Le Guin Scifi 40.98 € Vintage ✓
The Hidden Tower 75 Frank Herbert Scifi 5.34 € Vintage ✓
The Luminous Tower 77 Kim Robinson, Frank Herbert, and Joe Abercrombie Scifi 28.81 € Vintage ✓
The Luminous Station 94 Adrian Tchaikovsky and Mary Shelley Fiction 26.90 € Vintage ✓
The Dispossessed Ocean 101 Ann Leckie Fiction 12.58 € Vintage ✓
The Hidden Garden 109 Ted Chiang Fiction 22.95 € Vintage ✓
The Quiet Forest 113 Adrian Tchaikovsky and Octavia Butler Fiction 33.56 € Vintage ✓