lemmy/migrations/2019-05-02-051656_community_view_hot_rank/up.sql

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DROP VIEW community_view;
CREATE VIEW community_view AS
with all_community AS (
SELECT
*,
(
SELECT
name
FROM
user_ u
WHERE
c.creator_id = u.id) AS creator_name,
(
SELECT
name
FROM
category ct
WHERE
c.category_id = ct.id) AS category_name,
(
SELECT
count(*)
FROM
community_follower cf
WHERE
cf.community_id = c.id) AS number_of_subscribers,
(
SELECT
count(*)
FROM
post p
WHERE
p.community_id = c.id) AS number_of_posts,
(
SELECT
count(*)
FROM
comment co,
post p
WHERE
c.id = p.community_id
AND p.id = co.post_id) AS number_of_comments,
hot_rank ((
SELECT
count(*)
FROM community_follower cf
WHERE
cf.community_id = c.id), c.published) AS hot_rank
FROM
community c
)
SELECT
ac.*,
u.id AS user_id,
(
SELECT
cf.id::boolean
FROM
community_follower cf
WHERE
u.id = cf.user_id
AND ac.id = cf.community_id) AS subscribed
FROM
user_ u
CROSS JOIN all_community ac
UNION ALL
SELECT
ac.*,
NULL AS user_id,
NULL AS subscribed
FROM
all_community ac;