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 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
| Cover | Title | Author names | Genre | Price | Publisher | Active | ||
|---|---|---|---|---|---|---|---|---|
|
|
||||||||
| — 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 4 | ||||||||
 |
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 | ✓ | ||
| Ace 4 | ||||||||
| Orbit 6 | ||||||||
| Gollancz 3 | ||||||||
| DAW 3 | ||||||||
| Baen 8 | ||||||||
| Del Rey 3 | ||||||||
| Vintage 6 | ||||||||