Grouped table
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 41 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 | ||
|---|---|---|---|---|---|---|---|---|
|
|
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| — 1 | ||||||||
 |
The Endless Dune 26 | Ursula Le Guin and Joe Abercrombie | Fiction | 26.43 € | — | ✓ | ||
| Tor Books 3 | ||||||||
| Ace 2 | ||||||||
| Orbit 1 | ||||||||
 |
The Hidden Forest 40 | Martha Wells, Joe Abercrombie, and Mary Shelley | Fiction | 37.54 € | Orbit | ✓ | ||
| Gollancz 3 | ||||||||
 |
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 | ✓ | ||
| DAW 1 | ||||||||
 |
The Luminous Ocean 25 | Margaret Atwood | Fiction | 37.67 € | DAW | ✓ | ||
| Baen 3 | ||||||||
 |
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 | ✓ | ||
| Del Rey 1 | ||||||||
 |
The Burning Machine 8 | Margaret Atwood and Becky Chambers | Fiction | 38.02 € | Del Rey | ✓ | ||
| Vintage 1 | ||||||||