CrudComponents Playground

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 15 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 %>


	Cover	Title	Author names	Genre	Price	Publisher	Active

Fiction 4
		The Broken Engine 4	Liu Cixin, Ann Leckie, and Ursula Le Guin	Fiction	12.63 €	Vintage	✓
		The Burning Machine 8	Margaret Atwood and Becky Chambers	Fiction	38.02 €	Del Rey	✓
		The Ancient Tower 11	Ted Chiang, Ann Leckie, and Frank Herbert	Fiction	40.82 €	Gollancz	✗
		The Endless Machine 14	Ann Leckie, Ursula Le Guin, and Joe Abercrombie	Fiction	8.37 €	Gollancz	✓
Scifi 5
		The Silent Tower 3	Stanisław Lem and Martha Wells	Scifi	43.93 €	Vintage	✓
		The Burning Machine 7	Octavia Butler	Scifi	10.40 €	—	✓
		The Hidden Dune 9	Iain Banks	Scifi	42.43 €	Orbit	✓
		The Broken Dune 10	Liu Cixin, Margaret Atwood, and Martha Wells	Scifi	13.54 €	Del Rey	✓
		The Quiet Station 12	Joe Abercrombie	Scifi	11.40 €	Gollancz	✓
Nonfiction 6

Grouped table