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
The Hidden Forest 1 Frank Herbert, Ted Chiang, and Ann Leckie Nonfiction 28.24 € Orbit ✗
The Broken Garden 6 Stanisław Lem, Ursula Le Guin, and Iain Banks Nonfiction 19.85 € Orbit ✓
The Hidden Dune 9 Iain Banks Scifi 42.43 € Orbit ✓
The Endless Garden 15 Ursula Le Guin, Joe Abercrombie, and Adrian Tchaikovsky Nonfiction 29.85 € Orbit ✓
The Hidden Dune 21 Octavia Butler Nonfiction 16.41 € Orbit ✓
The Hidden Forest 40 Martha Wells, Joe Abercrombie, and Mary Shelley Fiction 37.54 € Orbit ✓
The Silent Machine 49 Iain Banks Nonfiction 20.70 € Orbit ✓
The Broken Machine 61 Ann Leckie Fiction 30.16 € Orbit ✓
The Ancient City 72 Stanisław Lem, Mary Shelley, and Frank Herbert Fiction 34.41 € Orbit ✓
The Silent City 75 Iain Banks and Octavia Butler Fiction 44.32 € Orbit ✓
The Distant Station 94 Joe Abercrombie Scifi 19.41 € Orbit ✓
The Distant Station 106 Frank Herbert and Mary Shelley Fiction 12.86 € Orbit ✓
The Hidden Dune 110 Iain Banks, Joe Abercrombie, and Frank Herbert Fiction 40.26 € Orbit ✓
The Distant Door 119 Ted Chiang and Kim Robinson Nonfiction 29.94 € Orbit ✓
Gollancz 11
DAW 15
Baen 10
Del Rey 13
Vintage 19