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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— 6
Tor Books 2
Ace 6
Orbit 2
The Hidden Winter 32 Kim Robinson, Stanisław Lem, and Margaret Atwood Scifi 40.79 € Orbit ✓
The Ancient Forest 56 Iain Banks, Ursula Le Guin, and Kim Robinson Scifi 33.64 € Orbit ✓
Gollancz 3
DAW 5
The Distant City 10 Stanisław Lem, Ted Chiang, and Liu Cixin Scifi 26.91 € DAW ✓
The Quiet City 27 Frank Herbert Scifi 39.79 € DAW ✓
The Silent Archive 40 Ann Leckie Scifi 41.43 € DAW ✓
The Dispossessed City 66 Octavia Butler Scifi 29.12 € DAW ✓
The Silent Station 120 Martha Wells, Becky Chambers, and Mary Shelley Scifi 42.11 € DAW ✓
Baen 2
Del Rey 3
The Endless Forest 15 Octavia Butler, Ann Leckie, and Liu Cixin Scifi 11.84 € Del Rey ✓
The Endless Signal 73 Frank Herbert, Iain Banks, and Margaret Atwood Scifi 19.39 € Del Rey ✓
The Distant Engine 83 Martha Wells, Liu Cixin, and Ursula Le Guin Scifi 39.52 € Del Rey ✓
Vintage 5