alice.pds.demo.boltless.dev
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appview/db: query distinct follow rows on query
We keep duplicated follow records in db to delete them on unfollow. So
instead of having unique constraint, we deduplicate them on query.
Signed-off-by: Seongmin Lee <git@boltless.me>
author
Seongmin Lee
committer
Tangled
date
(Jul 17, 2026, 6:25 PM +0300)
commit
49add549
49add5497225687114185e75de7414d55f4a145f
parent
7b0f21f2
7b0f21f2984fa89febc646fb163d488530af5d38
change-id
ksoylnkv
ksoylnkvqqnwmzxzmnwovzrwztpvwzqo
+5
-5
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-5
appview/db/follow.go
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-5
appview/db/follow.go
···
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// GetMostFollowed returns the DIDs with the most followers, most-followed first.
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func GetMostFollowed(e Execer, limit int) ([]string, error) {
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query := `
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select subject_did, count(*) as followers
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select subject_did, count(distinct did) as followers
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from follows
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group by subject_did
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order by followers desc
···
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var followers, following int64
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err := e.QueryRow(
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`SELECT
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COUNT(CASE WHEN subject_did = ? THEN 1 END) AS followers,
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COUNT(CASE WHEN did = ? THEN 1 END) AS following
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COUNT(DISTINCT CASE WHEN subject_did = ? THEN did END) AS followers,
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COUNT(DISTINCT CASE WHEN did = ? THEN subject_did END) AS following
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FROM follows;`, did, did).Scan(&followers, &following)
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if err != nil {
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return models.FollowStats{}, err
···
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coalesce(f.followers, 0) as followers,
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coalesce(g.following, 0) as following
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from (
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select subject_did as did, count(*) as followers
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select subject_did as did, count(distinct did) as followers
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from follows
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where subject_did in (%s)
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group by subject_did
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) f
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full outer join (
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select did as did, count(*) as following
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select did as did, count(distinct subject_did) as following
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from follows
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where did in (%s)
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group by did