Grouped table

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 33 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 %>

Read more: Grouping

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	Cover	Title	Author names	Genre	Price	Publisher	Active
								Reset
Fiction 14
		The Ancient Winter 3	Joe Abercrombie	Fiction	24.81 €	DAW	✗
		The Dispossessed City 4	Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky	Fiction	19.95 €	—	✓
		The Dispossessed City 7	Liu Cixin, Octavia Butler, and Kim Robinson	Fiction	17.82 €	Vintage	✓
		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 Endless Dune 17	Joe Abercrombie, Mary Shelley, and Stanisław Lem	Fiction	18.69 €	Tor Books	✓
		The Hidden Mirror 19	Joe Abercrombie, Ursula Le Guin, and Adrian Tchaikovsky	Fiction	37.51 €	Vintage	✓
		The Hidden Archive 22	Becky Chambers, Mary Shelley, and Frank Herbert	Fiction	23.21 €	—	✓
		The Ancient Mirror 24	Mary Shelley	Fiction	33.42 €	Gollancz	✓
		The Endless Winter 25	Ann Leckie	Fiction	41.02 €	Del Rey	✓
		The Endless Winter 28	Iain Banks, Liu Cixin, and Ted Chiang	Fiction	29.97 €	Tor Books	✓
		The Hidden Engine 31	Becky Chambers, Mary Shelley, and Stanisław Lem	Fiction	32.85 €	Vintage	✓
		The Endless Signal 33	Adrian Tchaikovsky	Fiction	39.74 €	Ace	✓