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
The Burning Machine 7 Octavia Butler Scifi 10.40 € — ✓
The Endless Dune 26 Ursula Le Guin and Joe Abercrombie Fiction 26.43 € — ✓
The Endless Empire 41 Kim Robinson and Ted Chiang Scifi 30.81 € — ✓
The Broken Empire 69 Ted Chiang Nonfiction 29.21 € — ✓
The Endless Ocean 79 Liu Cixin Fiction 24.96 € — ✓
The Distant Dune 86 Adrian Tchaikovsky and Stanisław Lem Scifi 41.33 € — ✓
The Endless Garden 99 Martha Wells and Kim Robinson Nonfiction 17.29 € — ✓
The Dispossessed Dune 102 Frank Herbert, Joe Abercrombie, and Mary Shelley Fiction 37.91 € — ✓
The Luminous Empire 113 Ted Chiang, Mary Shelley, and Kim Robinson Scifi 31.61 € — ✓
The Quiet Dune 115 Ursula Le Guin Fiction 42.25 € — ✓
Tor Books 13
Ace 15
Orbit 14
Gollancz 11
DAW 15
Baen 10
Del Rey 13
Vintage 19