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
Reset
— 3
Ace 4
The Quiet Forest 8 Becky Chambers Fiction 11.98 € Ace ✗
The Hidden Mirror 14 Ursula Le Guin and Kim Robinson Nonfiction 22.58 € Ace ✗
The Luminous Mirror 84 Kim Robinson and Ann Leckie Nonfiction 19.40 € Ace ✗
The Dispossessed Door 103 Iain Banks and Frank Herbert Fiction 30.10 € Ace ✗
Orbit 3
The Hidden Forest 1 Frank Herbert, Ted Chiang, and Ann Leckie Nonfiction 28.24 € Orbit ✗
The Broken Empire 48 Ted Chiang and Ann Leckie Fiction 30.49 € Orbit ✗
The Luminous Ocean 108 Ted Chiang Nonfiction 39.89 € Orbit ✗
Gollancz 2
The Broken Engine 9 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 32.99 € Gollancz ✗
The Quiet Door 18 Becky Chambers Scifi 21.79 € Gollancz ✗
DAW 7
The Ancient Winter 3 Joe Abercrombie Fiction 24.81 € DAW ✗
The Endless Station 13 Ann Leckie, Martha Wells, and Ursula Le Guin Fiction 27.05 € DAW ✗
The Hidden Engine 23 Stanisław Lem, Adrian Tchaikovsky, and Becky Chambers Scifi 40.55 € 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 Burning Empire 118 Kim Robinson, Mary Shelley, and Margaret Atwood Fiction 17.01 € DAW ✗
The Ancient Archive 119 Octavia Butler and Mary Shelley Fiction 21.49 € DAW ✗
Baen 1
Del Rey 2
Vintage 1