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
The Hidden Forest 40 Martha Wells, Joe Abercrombie, and Mary Shelley Fiction 37.54 € 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 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 ✓
Gollancz 4
DAW 3
The Luminous Ocean 25 Margaret Atwood Fiction 37.67 € DAW ✓
The Burning Station 87 Adrian Tchaikovsky and Joe Abercrombie Fiction 15.13 € DAW ✓
The Dispossessed Archive 114 Octavia Butler and Joe Abercrombie Fiction 8.47 € DAW ✓
Baen 8
Del Rey 3
Vintage 7