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: :genre — 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: :genre %>   <%# belongs_to, enum or a column %>

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Cover Title Author names Genre Price Publisher Active
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Fiction 10
The Ancient Winter 3 Joe Abercrombie Fiction 24.81 € DAW ✗
The Quiet Forest 8 Becky Chambers Fiction 11.98 € Ace ✗
The Broken Engine 9 Ted Chiang, Ann Leckie, and Frank Herbert Fiction 32.99 € Gollancz ✗
The Endless Station 13 Ann Leckie, Martha Wells, and Ursula Le Guin Fiction 27.05 € DAW ✗
The Broken Empire 48 Ted Chiang and Ann Leckie Fiction 30.49 € Orbit ✗
The Burning Archive 100 Joe Abercrombie Fiction 24.48 € — ✗
The Dispossessed Door 103 Iain Banks and Frank Herbert Fiction 30.10 € Ace ✗
The Silent Engine 115 Octavia Butler, Margaret Atwood, and Ursula Le Guin Fiction 24.38 € — ✗
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 ✗
Scifi 4
The Ancient Signal 16 Joe Abercrombie Scifi 35.51 € Del Rey ✗
The Quiet Door 18 Becky Chambers Scifi 21.79 € Gollancz ✗
The Hidden Engine 23 Stanisław Lem, Adrian Tchaikovsky, and Becky Chambers Scifi 40.55 € DAW ✗
The Hidden Engine 78 Iain Banks Scifi 8.00 € — ✗
Nonfiction 9