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 31 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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| Orbit 3 | ||||||||
 |
The Broken Garden 6 | Stanisław Lem, Ursula Le Guin, and Iain Banks | Nonfiction | 19.85 € | Orbit | ✓ | ||
 |
The Endless Garden 15 | Ursula Le Guin, Joe Abercrombie, and Adrian Tchaikovsky | Nonfiction | 29.85 € | Orbit | ✓ | ||
 |
The Hidden Dune 21 | Octavia Butler | Nonfiction | 16.41 € | Orbit | ✓ | ||
| Gollancz 1 | ||||||||
 |
The Hidden Engine 13 | Margaret Atwood and Frank Herbert | Nonfiction | 33.63 € | Gollancz | ✓ | ||
| DAW 2 | ||||||||
 |
The Burning City 27 | Ann Leckie | Nonfiction | 29.92 € | DAW | ✓ | ||
 |
The Silent Door 29 | Iain Banks | Nonfiction | 38.24 € | DAW | ✓ | ||
| Baen 1 | ||||||||
 |
The Endless Tower 30 | Liu Cixin, Ted Chiang, and Becky Chambers | Nonfiction | 38.98 € | Baen | ✓ | ||
| Vintage 2 | ||||||||