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
The Hidden Garden 16 Joe Abercrombie, Ted Chiang, and Becky Chambers Fiction 30.44 € Tor Books ✓
The Quiet Machine 31 Margaret Atwood Fiction 21.83 € Tor Books ✓
The Ancient Engine 32 Octavia Butler Fiction 33.11 € Tor Books ✓
The Endless Station 47 Joe Abercrombie and Kim Robinson Fiction 26.37 € Tor Books ✓
The Dispossessed Ocean 67 Martha Wells Fiction 40.62 € Tor Books ✗
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
The Ancient Ocean 17 Martha Wells, Ted Chiang, and Stanisław Lem Fiction 34.01 € Baen ✓
The Ancient Ocean 19 Frank Herbert Fiction 43.54 € Baen ✓
The Hidden Door 22 Frank Herbert Fiction 30.21 € Baen ✓
The Broken Dune 63 Liu Cixin and Mary Shelley Fiction 6.27 € Baen ✓
The Luminous Ocean 64 Becky Chambers and Stanisław Lem Fiction 33.85 € Baen ✓
The Ancient Signal 88 Becky Chambers and Frank Herbert Fiction 19.15 € Baen ✓
The Hidden Door 95 Mary Shelley Fiction 21.22 € Baen ✓
The Luminous Empire 97 Liu Cixin Fiction 13.61 € Baen ✓
Del Rey 3
The Burning Machine 8 Margaret Atwood and Becky Chambers Fiction 38.02 € Del Rey ✓
The Broken Empire 43 Ursula Le Guin Fiction 20.31 € Del Rey ✓
The Silent Winter 120 Iain Banks Fiction 16.22 € Del Rey ✓
Vintage 7