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
Tor Books 11
Ace 12
The Burning Tower 20 Ann Leckie Scifi 14.56 € Ace ✓
The Endless Winter 30 Octavia Butler Scifi 39.19 € Ace ✓
The Endless Signal 33 Adrian Tchaikovsky Fiction 39.74 € Ace ✓
The Distant Garden 34 Ted Chiang Nonfiction 25.55 € Ace ✓
The Burning Station 50 Ursula Le Guin and Octavia Butler Fiction 14.43 € Ace ✓
The Luminous City 57 Adrian Tchaikovsky, Frank Herbert, and Margaret Atwood Scifi 23.17 € Ace ✓
The Broken Empire 58 Martha Wells Scifi 34.83 € Ace ✓
The Luminous Engine 76 Mary Shelley Fiction 34.79 € Ace ✓
The Dispossessed Archive 82 Octavia Butler and Ted Chiang Scifi 35.72 € Ace ✓
The Luminous Tower 88 Frank Herbert, Liu Cixin, and Ursula Le Guin Nonfiction 37.25 € Ace ✓
The Hidden Tower 91 Adrian Tchaikovsky, Frank Herbert, and Kim Robinson Scifi 29.28 € Ace ✓
The Ancient Archive 114 Frank Herbert, Kim Robinson, and Margaret Atwood Nonfiction 44.21 € Ace ✓
Orbit 6
Gollancz 9
DAW 12
Baen 7
Del Rey 10
Vintage 14