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

Cover Title Author names Genre Price Publisher Active
— 19
Tor Books 11
Ace 16
Orbit 9
Gollancz 11
DAW 19
Baen 8
Del Rey 12
The Quiet Mirror 5 Kim Robinson, Liu Cixin, and Becky Chambers Nonfiction 32.73 € Del Rey ✓
The Endless Forest 15 Octavia Butler, Ann Leckie, and Liu Cixin Scifi 11.84 € Del Rey ✓
The Ancient Signal 16 Joe Abercrombie Scifi 35.51 € Del Rey ✗
The Endless Winter 25 Ann Leckie Fiction 41.02 € Del Rey ✓
The Hidden Tower 47 Martha Wells Nonfiction 19.92 € Del Rey ✓
The Ancient Ocean 53 Martha Wells and Ursula Le Guin Fiction 25.74 € 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 Endless Signal 73 Frank Herbert, Iain Banks, and Margaret Atwood Scifi 19.39 € Del Rey ✓
The Burning Forest 81 Ted Chiang, Becky Chambers, and Liu Cixin Nonfiction 6.28 € Del Rey ✓
The Distant Engine 83 Martha Wells, Liu Cixin, and Ursula Le Guin Scifi 39.52 € Del Rey ✓
The Hidden Winter 92 Margaret Atwood, Octavia Butler, and Iain Banks Nonfiction 29.93 € Del Rey ✓
Vintage 15