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rose-ash/lib/feed/tests/page.sx
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feed: pagination — offset/limit + cursor-by-at (before/after/page-before/next-cursor) + 14 tests
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-06 16:58:36 +00:00

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; Follow-up — pagination (offset + cursor). (feed-test name got expected)
; ---------- offset / limit ----------
(define
O
(feed/stream
(list
(feed/activity "u" "post" "o1" 1 (list))
(feed/activity "u" "post" "o2" 2 (list))
(feed/activity "u" "post" "o3" 3 (list))
(feed/activity "u" "post" "o4" 4 (list))
(feed/activity "u" "post" "o5" 5 (list)))))
(feed-test
"page 1"
(map
(fn (a) (get a :object))
(feed/items (feed/page O 0 2)))
(list "o1" "o2"))
(feed-test
"page 2"
(map
(fn (a) (get a :object))
(feed/items (feed/page O 2 2)))
(list "o3" "o4"))
(feed-test
"page 3 (partial)"
(map
(fn (a) (get a :object))
(feed/items (feed/page O 4 2)))
(list "o5"))
(feed-test
"page past end empty"
(feed/count (feed/page O 10 2))
0)
(feed-test "page-count 5/2 = 3" (feed/page-count O 2) 3)
(feed-test "page-count 5/5 = 1" (feed/page-count O 5) 1)
; ---------- cursor (recency) ----------
(define
R
(feed/stream
(list
(feed/activity "u" "post" "a" 50 (list))
(feed/activity "u" "post" "b" 40 (list))
(feed/activity "u" "post" "c" 30 (list))
(feed/activity "u" "post" "d" 20 (list))
(feed/activity "u" "post" "e" 10 (list)))))
(define p1 (feed/page-before R 100 2))
(feed-test
"cursor page 1 newest first"
(map (fn (a) (get a :object)) (feed/items p1))
(list "a" "b"))
(feed-test "next cursor after page 1" (feed/next-cursor p1) 40)
(define p2 (feed/page-before R (feed/next-cursor p1) 2))
(feed-test
"cursor page 2"
(map (fn (a) (get a :object)) (feed/items p2))
(list "c" "d"))
(feed-test "next cursor after page 2" (feed/next-cursor p2) 20)
(define p3 (feed/page-before R (feed/next-cursor p2) 2))
(feed-test
"cursor page 3 (partial)"
(map (fn (a) (get a :object)) (feed/items p3))
(list "e"))
(feed-test
"empty page nil cursor"
(feed/next-cursor (feed/page-before R 5 2))
nil)
(feed-test
"after cursor loads newer"
(map
(fn (a) (get a :object))
(feed/items (feed/recent (feed/after R 30))))
(list "a" "b"))
(feed-test
"before cursor count"
(feed/count (feed/before R 30))
2)