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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| — 8 | ||||||||
| Tor Books 6 | ||||||||
| Ace 5 | ||||||||
 |
The Quiet Forest 8 | Becky Chambers | Fiction | 11.98 € | Ace | ✗ | ||
 |
The Endless Signal 33 | Adrian Tchaikovsky | Fiction | 39.74 € | Ace | ✓ | ||
 |
The Burning Station 50 | Ursula Le Guin and Octavia Butler | Fiction | 14.43 € | Ace | ✓ | ||
 |
The Luminous Engine 76 | Mary Shelley | Fiction | 34.79 € | Ace | ✓ | ||
 |
The Dispossessed Door 103 | Iain Banks and Frank Herbert | Fiction | 30.10 € | Ace | ✗ | ||
| Orbit 4 | ||||||||
| Gollancz 4 | ||||||||
| DAW 6 | ||||||||
| Del Rey 2 | ||||||||
| Vintage 8 | ||||||||