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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— 4
Tor Books 3
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
The Distant Door 26 Ann Leckie, Iain Banks, and Liu Cixin Nonfiction 16.40 € Gollancz ✓
The Ancient Ocean 74 Margaret Atwood Nonfiction 14.70 € Gollancz ✓
The Broken City 102 Ann Leckie, Margaret Atwood, and Frank Herbert Nonfiction 40.54 € Gollancz ✓
DAW 7
The Dispossessed Winter 29 Ted Chiang and Ann Leckie Nonfiction 9.04 € DAW ✓
The Silent Station 60 Becky Chambers, Octavia Butler, and Margaret Atwood Nonfiction 34.96 € DAW ✗
The Broken Station 61 Octavia Butler Nonfiction 18.89 € DAW ✗
The Luminous City 85 Liu Cixin, Stanisław Lem, and Iain Banks Nonfiction 22.63 € DAW ✓
The Endless Engine 97 Becky Chambers Nonfiction 43.50 € DAW ✓
The Endless Mirror 98 Adrian Tchaikovsky, Martha Wells, and Ann Leckie Nonfiction 33.32 € DAW ✓
The Distant Archive 111 Frank Herbert Nonfiction 11.59 € DAW ✓
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