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: :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
— 4
Tor Books 4
Ace 4
Orbit 6
Gollancz 3
		The Endless Machine 14	Ann Leckie, Ursula Le Guin, and Joe Abercrombie	Fiction	8.37 €	Gollancz	✓
		The Burning Door 23	Ann Leckie and Martha Wells	Fiction	15.15 €	Gollancz	✓
		The Ancient City 52	Margaret Atwood	Fiction	17.77 €	Gollancz	✓
DAW 3
		The Luminous Ocean 25	Margaret Atwood	Fiction	37.67 €	DAW	✓
		The Burning Station 87	Adrian Tchaikovsky and Joe Abercrombie	Fiction	15.13 €	DAW	✓
		The Dispossessed Archive 114	Octavia Butler and Joe Abercrombie	Fiction	8.47 €	DAW	✓
Baen 8
Del Rey 3
		The Burning Machine 8	Margaret Atwood and Becky Chambers	Fiction	38.02 €	Del Rey	✓
		The Broken Empire 43	Ursula Le Guin	Fiction	20.31 €	Del Rey	✓
		The Silent Winter 120	Iain Banks	Fiction	16.22 €	Del Rey	✓
Vintage 6