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: :genre — 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: :genre %> <%# belongs_to, enum or a column %>Read more: Grouping
| Cover | Title | Author names | Genre | Price | Publisher | Active | ||
|---|---|---|---|---|---|---|---|---|
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| Fiction 4 | ||||||||
 |
The Ancient Tower 11 | Ted Chiang, Ann Leckie, and Frank Herbert | Fiction | 40.82 € | Gollancz | ✗ | ||
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The Dispossessed Ocean 67 | Martha Wells | Fiction | 40.62 € | Tor Books | ✗ | ||
 |
The Hidden Signal 85 | Becky Chambers, Liu Cixin, and Margaret Atwood | Fiction | 20.30 € | Ace | ✗ | ||
 |
The Broken Mirror 96 | Stanisław Lem | Fiction | 34.38 € | Vintage | ✗ | ||
| Scifi 3 | ||||||||
 |
The Dispossessed Winter 73 | Adrian Tchaikovsky and Iain Banks | Scifi | 29.24 € | Ace | ✗ | ||
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The Hidden Archive 98 | Martha Wells and Ursula Le Guin | Scifi | 27.03 € | DAW | ✗ | ||
 |
The Endless Machine 117 | Ted Chiang and Kim Robinson | Scifi | 14.47 € | Gollancz | ✗ | ||
| Nonfiction 8 | ||||||||
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The Hidden Forest 1 | Frank Herbert, Ted Chiang, and Ann Leckie | Nonfiction | 28.24 € | Orbit | ✗ | ||
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The Dispossessed Winter 24 | Ted Chiang | Nonfiction | 19.40 € | Del Rey | ✗ | ||
 |
The Broken Ocean 68 | Kim Robinson and Stanisław Lem | Nonfiction | 6.07 € | Tor Books | ✗ | ||
 |
The Quiet Dune 76 | Mary Shelley | Nonfiction | 24.14 € | Vintage | ✗ | ||
 |
The Distant Engine 80 | Joe Abercrombie, Iain Banks, and Ann Leckie | Nonfiction | 43.18 € | Del Rey | ✗ | ||
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The Endless Winter 84 | Iain Banks | Nonfiction | 34.31 € | Vintage | ✗ | ||
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The Luminous Tower 89 | Joe Abercrombie, Liu Cixin, and Margaret Atwood | Nonfiction | 22.68 € | Ace | ✗ | ||
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The Silent Dune 107 | Stanisław Lem and Octavia Butler | Nonfiction | 17.86 € | Vintage | ✗ | ||