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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— 16
Tor Books 11
Ace 12
The Burning Tower 20 Ann Leckie Scifi 14.56 € Ace ✓
The Endless Winter 30 Octavia Butler Scifi 39.19 € Ace ✓
The Endless Signal 33 Adrian Tchaikovsky Fiction 39.74 € Ace ✓
The Distant Garden 34 Ted Chiang Nonfiction 25.55 € Ace ✓
The Burning Station 50 Ursula Le Guin and Octavia Butler Fiction 14.43 € Ace ✓
The Luminous City 57 Adrian Tchaikovsky, Frank Herbert, and Margaret Atwood Scifi 23.17 € Ace ✓
The Broken Empire 58 Martha Wells Scifi 34.83 € Ace ✓
The Luminous Engine 76 Mary Shelley Fiction 34.79 € Ace ✓
The Dispossessed Archive 82 Octavia Butler and Ted Chiang Scifi 35.72 € Ace ✓
The Luminous Tower 88 Frank Herbert, Liu Cixin, and Ursula Le Guin Nonfiction 37.25 € Ace ✓
The Hidden Tower 91 Adrian Tchaikovsky, Frank Herbert, and Kim Robinson Scifi 29.28 € Ace ✓
The Ancient Archive 114 Frank Herbert, Kim Robinson, and Margaret Atwood Nonfiction 44.21 € Ace ✓
Orbit 6
Gollancz 9
The Ancient Mirror 24 Mary Shelley Fiction 33.42 € Gollancz ✓
The Distant Door 26 Ann Leckie, Iain Banks, and Liu Cixin Nonfiction 16.40 € Gollancz ✓
The Silent Station 70 Octavia Butler Scifi 34.46 € Gollancz ✓
The Distant Dune 72 Octavia Butler and Margaret Atwood Scifi 32.20 € Gollancz ✓
The Ancient Ocean 74 Margaret Atwood Nonfiction 14.70 € Gollancz ✓
The Hidden Dune 79 Martha Wells and Ursula Le Guin Fiction 24.25 € Gollancz ✓
The Distant Winter 96 Martha Wells and Becky Chambers Fiction 10.36 € Gollancz ✓
The Broken City 102 Ann Leckie, Margaret Atwood, and Frank Herbert Nonfiction 40.54 € Gollancz ✓
The Dispossessed Signal 112 Ted Chiang and Frank Herbert Scifi 38.73 € Gollancz ✓
DAW 12
Baen 7
Del Rey 10
Vintage 14
The Endless Mirror 2 Ann Leckie, Mary Shelley, and Ursula Le Guin Nonfiction 28.63 € Vintage ✓
The Dispossessed City 7 Liu Cixin, Octavia Butler, and Kim Robinson Fiction 17.82 € Vintage ✓
The Hidden Mirror 19 Joe Abercrombie, Ursula Le Guin, and Adrian Tchaikovsky Fiction 37.51 € Vintage ✓
The Endless City 21 Ursula Le Guin, Frank Herbert, and Octavia Butler Scifi 36.46 € Vintage ✓
The Hidden Engine 31 Becky Chambers, Mary Shelley, and Stanisław Lem Fiction 32.85 € Vintage ✓
The Broken Dune 49 Margaret Atwood and Mary Shelley Scifi 22.90 € Vintage ✓
The Quiet Empire 59 Kim Robinson, Liu Cixin, and Ted Chiang Fiction 39.87 € Vintage ✓
The Endless City 69 Kim Robinson and Ursula Le Guin Scifi 40.98 € Vintage ✓
The Hidden Tower 75 Frank Herbert Scifi 5.34 € Vintage ✓
The Luminous Tower 77 Kim Robinson, Frank Herbert, and Joe Abercrombie Scifi 28.81 € Vintage ✓
The Luminous Station 94 Adrian Tchaikovsky and Mary Shelley Fiction 26.90 € Vintage ✓
The Dispossessed Ocean 101 Ann Leckie Fiction 12.58 € Vintage ✓
The Hidden Garden 109 Ted Chiang Fiction 22.95 € Vintage ✓
The Quiet Forest 113 Adrian Tchaikovsky and Octavia Butler Fiction 33.56 € Vintage ✓