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
— 10
Tor Books 13
Ace 15
Orbit 14
Gollancz 11
The Ancient Tower 11 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 40.82 € Gollancz ✗
The Quiet Station 12 Joe Abercrombie Scifi 11.40 € Gollancz ✓
The Hidden Engine 13 Margaret Atwood and Frank Herbert Nonfiction 33.63 € Gollancz ✓
The Endless Machine 14 Ann Leckie, Ursula Le Guin, and Joe Abercrombie Fiction 8.37 € Gollancz ✓
The Burning Door 23 Ann Leckie and Martha Wells Fiction 15.15 € Gollancz ✓
The Ancient City 52 Margaret Atwood Fiction 17.77 € Gollancz ✓
The Ancient Tower 54 Margaret Atwood Nonfiction 27.65 € Gollancz ✓
The Broken Door 55 Stanisław Lem and Ted Chiang Scifi 36.00 € Gollancz ✓
The Dispossessed Tower 90 Mary Shelley and Liu Cixin Scifi 33.21 € Gollancz ✓
The Ancient Winter 111 Ursula Le Guin Nonfiction 11.99 € Gollancz ✓
The Endless Machine 117 Ted Chiang and Kim Robinson Scifi 14.47 € Gollancz ✗
DAW 15
The Endless Mirror 20 Stanisław Lem and Ted Chiang Scifi 21.82 € DAW ✓
The Luminous Ocean 25 Margaret Atwood Fiction 37.67 € DAW ✓
The Burning City 27 Ann Leckie Nonfiction 29.92 € DAW ✓
The Silent Door 29 Iain Banks Nonfiction 38.24 € DAW ✓
The Endless Mirror 33 Frank Herbert Scifi 39.79 € DAW ✓
The Dispossessed Engine 36 Kim Robinson and Mary Shelley Scifi 23.93 € DAW ✓
The Broken Engine 46 Ted Chiang and Octavia Butler Scifi 5.74 € DAW ✓
The Broken Door 53 Adrian Tchaikovsky, Ted Chiang, and Margaret Atwood Scifi 33.91 € DAW ✓
The Silent Forest 62 Frank Herbert, Liu Cixin, and Stanisław Lem Scifi 35.70 € DAW ✓
The Burning Station 87 Adrian Tchaikovsky and Joe Abercrombie Fiction 15.13 € DAW ✓
The Endless Ocean 92 Liu Cixin Scifi 42.02 € DAW ✓
The Hidden Archive 98 Martha Wells and Ursula Le Guin Scifi 27.03 € DAW ✗
The Broken Door 100 Stanisław Lem Nonfiction 26.98 € DAW ✓
The Luminous City 105 Liu Cixin, Stanisław Lem, and Iain Banks Nonfiction 22.63 € DAW ✓
The Dispossessed Archive 114 Octavia Butler and Joe Abercrombie Fiction 8.47 € DAW ✓
Baen 10
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 Endless Tower 30 Liu Cixin, Ted Chiang, and Becky Chambers Nonfiction 38.98 € Baen ✓
The Ancient Mirror 56 Stanisław Lem and Joe Abercrombie Nonfiction 37.08 € Baen ✓
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 Ancient Signal 88 Becky Chambers and Frank Herbert Fiction 19.15 € Baen ✓
The Hidden Door 95 Mary Shelley Fiction 21.22 € Baen ✓
The Luminous Empire 97 Liu Cixin Fiction 13.61 € Baen ✓
Del Rey 13
Vintage 19