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 44 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 1 | ||||||||
| Ace 2 | ||||||||
| Orbit 1 | ||||||||
| Gollancz 1 | ||||||||
| DAW 1 | ||||||||
| Baen 3 | ||||||||
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The Dispossessed Station 12 | Martha Wells and Ann Leckie | Nonfiction | 16.58 € | Baen | ✓ | ||
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The Burning Door 36 | Kim Robinson | Nonfiction | 31.42 € | Baen | ✓ | ||
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The Silent Tower 39 | Ann Leckie, Mary Shelley, and Ursula Le Guin | Nonfiction | 25.60 € | Baen | ✓ | ||
| Del Rey 1 | ||||||||
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The Quiet Mirror 5 | Kim Robinson, Liu Cixin, and Becky Chambers | Nonfiction | 32.73 € | Del Rey | ✓ | ||
| Vintage 1 | ||||||||