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
Tor Books 11
The Endless Dune 17 Joe Abercrombie, Mary Shelley, and Stanisław Lem Fiction 18.69 € Tor Books ✓
The Endless Winter 28 Iain Banks, Liu Cixin, and Ted Chiang Fiction 29.97 € Tor Books ✓
The Broken Mirror 37 Margaret Atwood and Octavia Butler Nonfiction 7.28 € Tor Books ✓
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 Hidden Station 44 Margaret Atwood, Martha Wells, and Becky Chambers Scifi 12.11 € Tor Books ✓
The Ancient Machine 51 Ann Leckie and Ursula Le Guin Nonfiction 40.77 € Tor Books ✓
The Ancient Dune 67 Mary Shelley and Ann Leckie Fiction 38.41 € Tor Books ✓
The Quiet Door 87 Ted Chiang Scifi 35.06 € Tor Books ✓
The Quiet Tower 90 Octavia Butler, Ted Chiang, and Margaret Atwood Nonfiction 31.01 € Tor Books ✓
The Quiet Station 95 Adrian Tchaikovsky, Ursula Le Guin, and Stanisław Lem Fiction 6.29 € Tor Books ✓
Ace 16
Orbit 9
The Hidden Forest 1 Frank Herbert, Ted Chiang, and Ann Leckie Nonfiction 28.24 € Orbit ✗
The Hidden Winter 32 Kim Robinson, Stanisław Lem, and Margaret Atwood Scifi 40.79 € Orbit ✓
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 Ancient Forest 56 Iain Banks, Ursula Le Guin, and Kim Robinson Scifi 33.64 € Orbit ✓
The Distant Station 86 Frank Herbert and Mary Shelley Fiction 12.86 € Orbit ✓
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 ✗
Gollancz 11
DAW 19
Baen 8
Del Rey 12
Vintage 15