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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| — 4 | ||||||||
| Tor Books 3 | ||||||||
| Ace 3 | ||||||||
 |
The Distant Garden 34 | Ted Chiang | Nonfiction | 25.55 € | Ace | ✓ | ||
 |
The Luminous Tower 88 | Frank Herbert, Liu Cixin, and Ursula Le Guin | Nonfiction | 37.25 € | Ace | ✓ | ||
 |
The Ancient Archive 114 | Frank Herbert, Kim Robinson, and Margaret Atwood | Nonfiction | 44.21 € | Ace | ✓ | ||
| Orbit 1 | ||||||||
| Gollancz 3 | ||||||||
| DAW 5 | ||||||||
| Baen 5 | ||||||||
| Del Rey 5 | ||||||||
| Vintage 1 | ||||||||
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The Endless Mirror 2 | Ann Leckie, Mary Shelley, and Ursula Le Guin | Nonfiction | 28.63 € | Vintage | ✓ | ||