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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| — 7 | ||||||||
| Tor Books 2 | ||||||||
 |
The Hidden Station 44 | Margaret Atwood, Martha Wells, and Becky Chambers | Scifi | 12.11 € | Tor Books | ✓ | ||
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The Quiet Door 87 | Ted Chiang | Scifi | 35.06 € | Tor Books | ✓ | ||
| Ace 6 | ||||||||
| Orbit 2 | ||||||||
| Gollancz 4 | ||||||||
| DAW 6 | ||||||||
| Baen 2 | ||||||||
| Del Rey 4 | ||||||||
| Vintage 5 | ||||||||