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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| — 6 | ||||||||
| Tor Books 2 | ||||||||
| Ace 6 | ||||||||
| Orbit 2 | ||||||||
 |
The Hidden Winter 32 | Kim Robinson, Stanisław Lem, and Margaret Atwood | Scifi | 40.79 € | Orbit | ✓ | ||
 |
The Ancient Forest 56 | Iain Banks, Ursula Le Guin, and Kim Robinson | Scifi | 33.64 € | Orbit | ✓ | ||
| Gollancz 3 | ||||||||
| DAW 5 | ||||||||
| Baen 2 | ||||||||
 |
The Distant Tower 63 | Iain Banks, Liu Cixin, and Joe Abercrombie | Scifi | 18.55 € | Baen | ✓ | ||
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The Endless Ocean 105 | Liu Cixin and Kim Robinson | Scifi | 34.90 € | Baen | ✓ | ||
| Del Rey 3 | ||||||||
| Vintage 5 | ||||||||