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 37 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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| — 2 | ||||||||
 |
The Dispossessed City 4 | Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky | Fiction | 19.95 € | — | ✓ | ||
 |
The Hidden Archive 22 | Becky Chambers, Mary Shelley, and Frank Herbert | Fiction | 23.21 € | — | ✓ | ||
| Tor Books 2 | ||||||||
| Ace 2 | ||||||||
 |
The Quiet Forest 8 | Becky Chambers | Fiction | 11.98 € | Ace | ✗ | ||
 |
The Endless Signal 33 | Adrian Tchaikovsky | Fiction | 39.74 € | Ace | ✓ | ||
| Gollancz 2 | ||||||||
| DAW 2 | ||||||||
 |
The Ancient Winter 3 | Joe Abercrombie | Fiction | 24.81 € | DAW | ✗ | ||
 |
The Endless Station 13 | Ann Leckie, Martha Wells, and Ursula Le Guin | Fiction | 27.05 € | DAW | ✗ | ||
| Del Rey 1 | ||||||||
 |
The Endless Winter 25 | Ann Leckie | Fiction | 41.02 € | Del Rey | ✓ | ||
| Vintage 3 | ||||||||