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

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Cover Title Author names Genre Price Publisher Active
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— 10
Tor Books 11
Ace 12
Orbit 13
Gollancz 9
DAW 14
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 11
Vintage 15
The Endless Mirror 2 Ann Leckie, Mary Shelley, and Ursula Le Guin Nonfiction 28.63 € Vintage ✓
The Silent Tower 3 Stanisław Lem and Martha Wells Scifi 43.93 € Vintage ✓
The Broken Engine 4 Liu Cixin, Ann Leckie, and Ursula Le Guin Fiction 12.63 € Vintage ✓
The Endless Empire 5 Ann Leckie Nonfiction 25.88 € Vintage ✓
The Ancient Ocean 44 Becky Chambers Nonfiction 25.72 € Vintage ✓
The Luminous City 45 Kim Robinson, Stanisław Lem, and Ann Leckie Scifi 40.14 € Vintage ✓
The Dispossessed Station 58 Joe Abercrombie, Ursula Le Guin, and Iain Banks Scifi 22.59 € Vintage ✓
The Silent Mirror 60 Ann Leckie and Kim Robinson Nonfiction 25.07 € Vintage ✓
The Hidden Station 66 Octavia Butler and Iain Banks Scifi 40.83 € Vintage ✓
The Distant Station 77 Iain Banks Scifi 38.94 € Vintage ✓
The Silent Tower 78 Adrian Tchaikovsky Fiction 16.99 € Vintage ✓
The Hidden Winter 82 Joe Abercrombie, Ann Leckie, and Mary Shelley Fiction 12.30 € Vintage ✓
The Ancient Engine 101 Adrian Tchaikovsky Fiction 37.89 € Vintage ✓
The Broken Winter 108 Ted Chiang Fiction 32.73 € Vintage ✓
The Endless City 112 Ann Leckie and Stanisław Lem Fiction 23.04 € Vintage ✓