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 37 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 | ||
|---|---|---|---|---|---|---|---|---|
|
|
||||||||
| — 1 | ||||||||
| Ace 1 | ||||||||
| — | The Endless Winter 37 | Octavia Butler | Scifi | 39.19 € | Ace | ✓ | ||
| Orbit 1 | ||||||||
 |
The Hidden Dune 9 | Iain Banks | Scifi | 42.43 € | Orbit | ✓ | ||
| Gollancz 1 | ||||||||
 |
The Quiet Station 12 | Joe Abercrombie | Scifi | 11.40 € | Gollancz | ✓ | ||
| DAW 3 | ||||||||
 |
The Endless Mirror 20 | Stanisław Lem and Ted Chiang | Scifi | 21.82 € | DAW | ✓ | ||
 |
The Endless Mirror 33 | Frank Herbert | Scifi | 39.79 € | DAW | ✓ | ||
 |
The Dispossessed Engine 36 | Kim Robinson and Mary Shelley | Scifi | 23.93 € | DAW | ✓ | ||
| Del Rey 3 | ||||||||
| Vintage 1 | ||||||||