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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| — 4 | ||||||||
| Tor Books 5 | ||||||||
| Ace 5 | ||||||||
 |
The Ancient Door 34 | Margaret Atwood and Mary Shelley | Fiction | 32.79 € | Ace | ✓ | ||
 |
The Hidden Mirror 35 | Ann Leckie | Fiction | 27.24 € | Ace | ✓ | ||
 |
The Hidden Signal 85 | Becky Chambers, Liu Cixin, and Margaret Atwood | Fiction | 20.30 € | Ace | ✗ | ||
 |
The Distant Dune 104 | Becky Chambers and Iain Banks | Fiction | 25.09 € | Ace | ✓ | ||
 |
The Distant Winter 118 | Joe Abercrombie | Fiction | 16.33 € | Ace | ✓ | ||
| Orbit 6 | ||||||||
| Gollancz 4 | ||||||||
| DAW 3 | ||||||||
 |
The Luminous Ocean 25 | Margaret Atwood | Fiction | 37.67 € | DAW | ✓ | ||
 |
The Burning Station 87 | Adrian Tchaikovsky and Joe Abercrombie | Fiction | 15.13 € | DAW | ✓ | ||
 |
The Dispossessed Archive 114 | Octavia Butler and Joe Abercrombie | Fiction | 8.47 € | DAW | ✓ | ||
| Baen 8 | ||||||||
| Del Rey 3 | ||||||||
| Vintage 7 | ||||||||