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

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Cover Title Author names Genre Price Publisher Active
Reset
— 4
The Endless Dune 26 Ursula Le Guin and Joe Abercrombie Fiction 26.43 € — ✓
The Endless Ocean 79 Liu Cixin Fiction 24.96 € — ✓
The Dispossessed Dune 102 Frank Herbert, Joe Abercrombie, and Mary Shelley Fiction 37.91 € — ✓
The Quiet Dune 115 Ursula Le Guin Fiction 42.25 € — ✓
Tor Books 5
Ace 5
Orbit 6
Gollancz 4
The Ancient Tower 11 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 40.82 € 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 ✓
DAW 3
Baen 8
Del Rey 3
Vintage 7
The Broken Engine 4 Liu Cixin, Ann Leckie, and Ursula Le Guin Fiction 12.63 € Vintage ✓
The Silent Tower 78 Adrian Tchaikovsky Fiction 16.99 € Vintage ✓
The Hidden Winter 82 Joe Abercrombie, Ann Leckie, and Mary Shelley Fiction 12.30 € Vintage ✓
The Broken Mirror 96 Stanisław Lem Fiction 34.38 € Vintage ✗
The Ancient Engine 101 Adrian Tchaikovsky Fiction 37.89 € Vintage ✓
The Broken Winter 108 Ted Chiang Fiction 32.73 € Vintage ✓
The Endless City 112 Ann Leckie and Stanisław Lem Fiction 23.04 € Vintage ✓