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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— 4
Tor Books 3
The Broken Mirror 37 Margaret Atwood and Octavia Butler Nonfiction 7.28 € Tor Books ✓
The Ancient Machine 51 Ann Leckie and Ursula Le Guin Nonfiction 40.77 € Tor Books ✓
The Quiet Tower 90 Octavia Butler, Ted Chiang, and Margaret Atwood Nonfiction 31.01 € Tor Books ✓
Ace 5
The Hidden Mirror 14 Ursula Le Guin and Kim Robinson Nonfiction 22.58 € Ace ✗
The Distant Garden 34 Ted Chiang Nonfiction 25.55 € Ace ✓
The Luminous Mirror 84 Kim Robinson and Ann Leckie Nonfiction 19.40 € Ace ✗
The Luminous Tower 88 Frank Herbert, Liu Cixin, and Ursula Le Guin Nonfiction 37.25 € Ace ✓
The Ancient Archive 114 Frank Herbert, Kim Robinson, and Margaret Atwood Nonfiction 44.21 € Ace ✓
Orbit 3
The Hidden Forest 1 Frank Herbert, Ted Chiang, and Ann Leckie Nonfiction 28.24 € Orbit ✗
The Hidden Door 106 Martha Wells, Mary Shelley, and Stanisław Lem Nonfiction 19.30 € Orbit ✓
The Luminous Ocean 108 Ted Chiang Nonfiction 39.89 € Orbit ✗
Gollancz 3
DAW 7
Baen 6
Del Rey 6
The Quiet Mirror 5 Kim Robinson, Liu Cixin, and Becky Chambers Nonfiction 32.73 € Del Rey ✓
The Hidden Tower 47 Martha Wells Nonfiction 19.92 € Del Rey ✓
The Dispossessed Empire 54 Margaret Atwood, Octavia Butler, and Stanisław Lem Nonfiction 43.50 € Del Rey ✓
The Hidden Ocean 65 Joe Abercrombie, Iain Banks, and Ann Leckie Nonfiction 43.18 € Del Rey ✗
The Burning Forest 81 Ted Chiang, Becky Chambers, and Liu Cixin Nonfiction 6.28 € Del Rey ✓
The Hidden Winter 92 Margaret Atwood, Octavia Butler, and Iain Banks Nonfiction 29.93 € Del Rey ✓
Vintage 2