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 31 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
— 4
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 € — ✓
Tor Books 2
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 ✓
Ace 4
Orbit 1
Gollancz 4
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 ✓
DAW 6
Baen 1
Del Rey 4
Vintage 5
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 ✓