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 3 | ||||||||
 |
The Broken Mirror 37 | Margaret Atwood and Octavia Butler | Nonfiction | 7.28 € | Tor Books | ✓ | ||
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The Ancient Machine 51 | Ann Leckie and Ursula Le Guin | Nonfiction | 40.77 € | Tor Books | ✓ | ||
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The Quiet Tower 90 | Octavia Butler, Ted Chiang, and Margaret Atwood | Nonfiction | 31.01 € | Tor Books | ✓ | ||
| Ace 3 | ||||||||
| Orbit 1 | ||||||||
| Gollancz 3 | ||||||||
| DAW 5 | ||||||||
| Baen 5 | ||||||||
| Del Rey 5 | ||||||||
| Vintage 1 | ||||||||