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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| — 3 | ||||||||
| Ace 4 | ||||||||
| Orbit 3 | ||||||||
| Gollancz 2 | ||||||||
| DAW 7 | ||||||||
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The Ancient Winter 3 | Joe Abercrombie | Fiction | 24.81 € | DAW | ✗ | ||
 |
The Endless Station 13 | Ann Leckie, Martha Wells, and Ursula Le Guin | Fiction | 27.05 € | DAW | ✗ | ||
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The Hidden Engine 23 | Stanisław Lem, Adrian Tchaikovsky, and Becky Chambers | Scifi | 40.55 € | DAW | ✗ | ||
 |
The Silent Station 60 | Becky Chambers, Octavia Butler, and Margaret Atwood | Nonfiction | 34.96 € | DAW | ✗ | ||
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The Broken Station 61 | Octavia Butler | Nonfiction | 18.89 € | DAW | ✗ | ||
 |
The Burning Empire 118 | Kim Robinson, Mary Shelley, and Margaret Atwood | Fiction | 17.01 € | DAW | ✗ | ||
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The Ancient Archive 119 | Octavia Butler and Mary Shelley | Fiction | 21.49 € | DAW | ✗ | ||
| Baen 1 | ||||||||
| Del Rey 2 | ||||||||
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The Ancient Signal 16 | Joe Abercrombie | Scifi | 35.51 € | Del Rey | ✗ | ||
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The Hidden Ocean 65 | Joe Abercrombie, Iain Banks, and Ann Leckie | Nonfiction | 43.18 € | Del Rey | ✗ | ||
| Vintage 1 | ||||||||