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 9 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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| — 2 | ||||||||
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The Dispossessed City 4 | Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky | Fiction | 19.95 € | — | ✓ | ||
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The Burning Winter 6 | Octavia Butler | Scifi | 21.78 € | — | ✓ | ||
| Ace 1 | ||||||||
| Orbit 1 | ||||||||
| Gollancz 1 | ||||||||
| — | The Broken Engine 9 | Ted Chiang, Ann Leckie, and Frank Herbert | Fiction | 32.99 € | Gollancz | ✗ | ||
| DAW 1 | ||||||||
| Del Rey 1 | ||||||||
| Vintage 2 | ||||||||
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The Endless Mirror 2 | Ann Leckie, Mary Shelley, and Ursula Le Guin | Nonfiction | 28.63 € | Vintage | ✓ | ||
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The Dispossessed City 7 | Liu Cixin, Octavia Butler, and Kim Robinson | Fiction | 17.82 € | Vintage | ✓ | ||