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
The Ancient Door 34 Margaret Atwood and Mary Shelley Fiction 32.79 € Ace ✓
The Hidden Mirror 35 Ann Leckie Fiction 27.24 € Ace ✓
The Endless Winter 37 Octavia Butler Scifi 39.19 € Ace ✓
The Hidden Machine 38 Joe Abercrombie and Ann Leckie Scifi 38.74 € Ace ✓
The Broken Machine 42 Ted Chiang Nonfiction 25.55 € Ace ✓
The Silent Forest 59 Stanisław Lem Scifi 14.46 € Ace ✓
The Luminous Garden 65 Liu Cixin and Ursula Le Guin Scifi 6.67 € Ace ✓
The Luminous Mirror 70 Adrian Tchaikovsky, Frank Herbert, and Margaret Atwood Scifi 8.90 € Ace ✓
The Dispossessed Winter 73 Adrian Tchaikovsky and Iain Banks Scifi 29.24 € Ace ✗
The Burning Signal 83 Frank Herbert Scifi 42.17 € Ace ✓
The Hidden Signal 85 Becky Chambers, Liu Cixin, and Margaret Atwood Fiction 20.30 € Ace ✗
The Luminous Tower 89 Joe Abercrombie, Liu Cixin, and Margaret Atwood Nonfiction 22.68 € Ace ✗
The Luminous Empire 93 Ann Leckie Scifi 14.02 € Ace ✓
The Distant Dune 104 Becky Chambers and Iain Banks Fiction 25.09 € Ace ✓
The Distant Winter 118 Joe Abercrombie Fiction 16.33 € Ace ✓
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
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