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: :genre — 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: :genre %>   <%# belongs_to, enum or a column %>

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Cover Title Author names Genre Price Publisher Active
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Fiction 41
Scifi 39
Nonfiction 25
The Endless Mirror 2 Ann Leckie, Mary Shelley, and Ursula Le Guin Nonfiction 28.63 € Vintage ✓
The Endless Empire 5 Ann Leckie Nonfiction 25.88 € Vintage ✓
The Broken Garden 6 Stanisław Lem, Ursula Le Guin, and Iain Banks Nonfiction 19.85 € Orbit ✓
The Hidden Engine 13 Margaret Atwood and Frank Herbert Nonfiction 33.63 € Gollancz ✓
The Endless Garden 15 Ursula Le Guin, Joe Abercrombie, and Adrian Tchaikovsky Nonfiction 29.85 € Orbit ✓
The Hidden Dune 21 Octavia Butler Nonfiction 16.41 € Orbit ✓
The Burning City 27 Ann Leckie Nonfiction 29.92 € DAW ✓
The Silent Door 29 Iain Banks Nonfiction 38.24 € DAW ✓
The Endless Tower 30 Liu Cixin, Ted Chiang, and Becky Chambers Nonfiction 38.98 € Baen ✓
The Broken Machine 42 Ted Chiang Nonfiction 25.55 € Ace ✓
The Ancient Ocean 44 Becky Chambers Nonfiction 25.72 € Vintage ✓
The Silent Machine 49 Iain Banks Nonfiction 20.70 € Orbit ✓
The Endless Signal 50 Mary Shelley, Ursula Le Guin, and Ted Chiang Nonfiction 26.36 € Tor Books ✓
The Dispossessed Door 51 Stanisław Lem and Becky Chambers Nonfiction 36.10 € Tor Books ✓
The Ancient Tower 54 Margaret Atwood Nonfiction 27.65 € Gollancz ✓
The Ancient Mirror 56 Stanisław Lem and Joe Abercrombie Nonfiction 37.08 € Baen ✓
The Silent Mirror 60 Ann Leckie and Kim Robinson Nonfiction 25.07 € Vintage ✓
The Broken Empire 69 Ted Chiang Nonfiction 29.21 € — ✓
The Dispossessed Engine 74 Adrian Tchaikovsky, Margaret Atwood, and Becky Chambers Nonfiction 39.15 € Del Rey ✓
The Endless Garden 99 Martha Wells and Kim Robinson Nonfiction 17.29 € — ✓
The Broken Door 100 Stanisław Lem Nonfiction 26.98 € DAW ✓
The Burning Garden 103 Stanisław Lem and Iain Banks Nonfiction 38.50 € Tor Books ✓
The Luminous City 105 Liu Cixin, Stanisław Lem, and Iain Banks Nonfiction 22.63 € DAW ✓
The Ancient Winter 111 Ursula Le Guin Nonfiction 11.99 € Gollancz ✓
The Distant Door 119 Ted Chiang and Kim Robinson Nonfiction 29.94 € Orbit ✓