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 6 | ||||||||
| Ace 3 | ||||||||
| Orbit 3 | ||||||||
| Gollancz 3 | ||||||||
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The Ancient Mirror 24 | Mary Shelley | Fiction | 33.42 € | Gollancz | ✓ | ||
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The Hidden Dune 79 | Martha Wells and Ursula Le Guin | Fiction | 24.25 € | Gollancz | ✓ | ||
 |
The Distant Winter 96 | Martha Wells and Becky Chambers | Fiction | 10.36 € | Gollancz | ✓ | ||
| DAW 2 | ||||||||
| Del Rey 2 | ||||||||
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The Endless Winter 25 | Ann Leckie | Fiction | 41.02 € | Del Rey | ✓ | ||
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The Ancient Ocean 53 | Martha Wells and Ursula Le Guin | Fiction | 25.74 € | Del Rey | ✓ | ||
| Vintage 8 | ||||||||