Grouped table

Group by publisher Group by genre
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
— 10
Tor Books 13
Ace 15
Orbit 14
Gollancz 11
DAW 15
Baen 10
The Ancient Ocean 17 Martha Wells, Ted Chiang, and Stanisław Lem Fiction 34.01 € Baen ✓
The Ancient Ocean 19 Frank Herbert Fiction 43.54 € Baen ✓
The Hidden Door 22 Frank Herbert Fiction 30.21 € Baen ✓
The Endless Tower 30 Liu Cixin, Ted Chiang, and Becky Chambers Nonfiction 38.98 € Baen ✓
The Ancient Mirror 56 Stanisław Lem and Joe Abercrombie Nonfiction 37.08 € Baen ✓
The Broken Dune 63 Liu Cixin and Mary Shelley Fiction 6.27 € Baen ✓
The Luminous Ocean 64 Becky Chambers and Stanisław Lem Fiction 33.85 € Baen ✓
The Ancient Signal 88 Becky Chambers and Frank Herbert Fiction 19.15 € Baen ✓
The Hidden Door 95 Mary Shelley Fiction 21.22 € Baen ✓
The Luminous Empire 97 Liu Cixin Fiction 13.61 € Baen ✓
Del Rey 13
Vintage 19