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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| Tor Books 2 | ||||||||
 |
The Dispossessed Ocean 67 | Martha Wells | Fiction | 40.62 € | Tor Books | ✗ | ||
 |
The Broken Ocean 68 | Kim Robinson and Stanisław Lem | Nonfiction | 6.07 € | Tor Books | ✗ | ||
| Ace 3 | ||||||||
| Orbit 1 | ||||||||
 |
The Hidden Forest 1 | Frank Herbert, Ted Chiang, and Ann Leckie | Nonfiction | 28.24 € | Orbit | ✗ | ||
| Gollancz 2 | ||||||||
| DAW 1 | ||||||||
| Del Rey 2 | ||||||||
| Vintage 4 | ||||||||
 |
The Quiet Dune 76 | Mary Shelley | Nonfiction | 24.14 € | Vintage | ✗ | ||
 |
The Endless Winter 84 | Iain Banks | Nonfiction | 34.31 € | Vintage | ✗ | ||
 |
The Broken Mirror 96 | Stanisław Lem | Fiction | 34.38 € | Vintage | ✗ | ||
 |
The Silent Dune 107 | Stanisław Lem and Octavia Butler | Nonfiction | 17.86 € | Vintage | ✗ | ||