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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| — 2 | ||||||||
| Tor Books 3 | ||||||||
| Ace 1 | ||||||||
| Orbit 5 | ||||||||
| Gollancz 3 | ||||||||
| DAW 4 | ||||||||
 |
The Burning City 27 | Ann Leckie | Nonfiction | 29.92 € | DAW | ✓ | ||
 |
The Silent Door 29 | Iain Banks | Nonfiction | 38.24 € | DAW | ✓ | ||
 |
The Broken Door 100 | Stanisław Lem | Nonfiction | 26.98 € | DAW | ✓ | ||
 |
The Luminous City 105 | Liu Cixin, Stanisław Lem, and Iain Banks | Nonfiction | 22.63 € | DAW | ✓ | ||
| Baen 2 | ||||||||
| Del Rey 1 | ||||||||
| Vintage 4 | ||||||||
 |
The Endless Mirror 2 | Ann Leckie, Mary Shelley, and Ursula Le Guin | Nonfiction | 28.63 € | Vintage | ✓ | ||
 |
The Endless Empire 5 | Ann Leckie | Nonfiction | 25.88 € | Vintage | ✓ | ||
 |
The Ancient Ocean 44 | Becky Chambers | Nonfiction | 25.72 € | Vintage | ✓ | ||
 |
The Silent Mirror 60 | Ann Leckie and Kim Robinson | Nonfiction | 25.07 € | Vintage | ✓ | ||