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 %>

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Cover Title Author names Genre Price Publisher Active
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— 4
Tor Books 4
Ace 7
Orbit 2
The Hidden Dune 9 Iain Banks Scifi 42.43 € Orbit ✓
The Distant Station 94 Joe Abercrombie Scifi 19.41 € Orbit ✓
Gollancz 3
DAW 7
Del Rey 7
The Broken Dune 10 Liu Cixin, Margaret Atwood, and Martha Wells Scifi 13.54 € Del Rey ✓
The Endless Forest 18 Octavia Butler, Ann Leckie, and Liu Cixin Scifi 11.84 € Del Rey ✓
The Distant Station 28 Liu Cixin Scifi 15.62 € Del Rey ✓
The Silent Signal 57 Frank Herbert Scifi 24.90 € Del Rey ✓
The Silent Signal 71 Margaret Atwood, Ursula Le Guin, and Iain Banks Scifi 35.42 € Del Rey ✓
The Quiet Forest 81 Kim Robinson and Joe Abercrombie Scifi 37.94 € Del Rey ✓
The Quiet Signal 91 Kim Robinson Scifi 9.09 € Del Rey ✓
Vintage 5