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 | ||
|---|---|---|---|---|---|---|---|---|
|
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| — 2 | ||||||||
| Tor Books 3 | ||||||||
 |
The Endless Signal 50 | Mary Shelley, Ursula Le Guin, and Ted Chiang | Nonfiction | 26.36 € | Tor Books | ✓ | ||
 |
The Dispossessed Door 51 | Stanisław Lem and Becky Chambers | Nonfiction | 36.10 € | Tor Books | ✓ | ||
 |
The Burning Garden 103 | Stanisław Lem and Iain Banks | Nonfiction | 38.50 € | Tor Books | ✓ | ||
| Ace 1 | ||||||||
| Orbit 5 | ||||||||
| Gollancz 3 | ||||||||
 |
The Hidden Engine 13 | Margaret Atwood and Frank Herbert | Nonfiction | 33.63 € | Gollancz | ✓ | ||
 |
The Ancient Tower 54 | Margaret Atwood | Nonfiction | 27.65 € | Gollancz | ✓ | ||
 |
The Ancient Winter 111 | Ursula Le Guin | Nonfiction | 11.99 € | Gollancz | ✓ | ||
| DAW 4 | ||||||||
| Baen 2 | ||||||||
| Del Rey 1 | ||||||||
| Vintage 4 | ||||||||