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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— 16
The Dispossessed City 4 Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky Fiction 19.95 € — ✓
The Burning Winter 6 Octavia Butler Scifi 21.78 € — ✓
The Endless Station 11 Joe Abercrombie Scifi 10.86 € — ✓
The Hidden Archive 22 Becky Chambers, Mary Shelley, and Frank Herbert Fiction 23.21 € — ✓
The Endless Door 35 Martha Wells Nonfiction 24.06 € — ✓
The Luminous Machine 41 Ursula Le Guin Nonfiction 23.63 € — ✓
The Distant Garden 52 Joe Abercrombie and Ursula Le Guin Fiction 36.80 € — ✓
The Endless Station 55 Ann Leckie, Frank Herbert, and Joe Abercrombie Nonfiction 20.24 € — ✓
The Dispossessed Forest 64 Liu Cixin Fiction 36.11 € — ✓
The Ancient Engine 71 Becky Chambers Scifi 32.68 € — ✓
The Ancient Engine 80 Martha Wells and Kim Robinson Nonfiction 17.29 € — ✓
The Dispossessed Empire 89 Kim Robinson and Joe Abercrombie Scifi 11.61 € — ✓
The Broken Forest 104 Octavia Butler and Frank Herbert Fiction 17.49 € — ✓
The Hidden Door 107 Iain Banks and Mary Shelley Scifi 17.84 € — ✓
The Silent Archive 116 Ted Chiang and Joe Abercrombie Fiction 10.28 € — ✓
The Endless Empire 117 Becky Chambers and Ted Chiang Scifi 29.30 € — ✓
Tor Books 11
Ace 12
Orbit 6
Gollancz 9
DAW 12
Baen 7
Del Rey 10
The Quiet Mirror 5 Kim Robinson, Liu Cixin, and Becky Chambers Nonfiction 32.73 € Del Rey ✓
The Endless Forest 15 Octavia Butler, Ann Leckie, and Liu Cixin Scifi 11.84 € Del Rey ✓
The Endless Winter 25 Ann Leckie Fiction 41.02 € Del Rey ✓
The Hidden Tower 47 Martha Wells Nonfiction 19.92 € Del Rey ✓
The Ancient Ocean 53 Martha Wells and Ursula Le Guin Fiction 25.74 € Del Rey ✓
The Dispossessed Empire 54 Margaret Atwood, Octavia Butler, and Stanisław Lem Nonfiction 43.50 € Del Rey ✓
The Endless Signal 73 Frank Herbert, Iain Banks, and Margaret Atwood Scifi 19.39 € Del Rey ✓
The Burning Forest 81 Ted Chiang, Becky Chambers, and Liu Cixin Nonfiction 6.28 € Del Rey ✓
The Distant Engine 83 Martha Wells, Liu Cixin, and Ursula Le Guin Scifi 39.52 € Del Rey ✓
The Hidden Winter 92 Margaret Atwood, Octavia Butler, and Iain Banks Nonfiction 29.93 € Del Rey ✓
Vintage 14