lemmy/migrations/2020-08-06-205355_update_co.../up.sql

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-- Drop first
DROP VIEW community_view;
DROP VIEW community_aggregates_view;
DROP VIEW community_fast_view;
DROP TABLE community_aggregates_fast;
CREATE VIEW community_aggregates_view AS
SELECT
c.id,
c.name,
c.title,
c.icon,
c.banner,
c.description,
c.category_id,
c.creator_id,
c.removed,
c.published,
c.updated,
c.deleted,
c.nsfw,
c.actor_id,
c.local,
c.last_refreshed_at,
u.actor_id AS creator_actor_id,
u.local AS creator_local,
u.name AS creator_name,
u.preferred_username AS creator_preferred_username,
u.avatar AS creator_avatar,
cat.name AS category_name,
coalesce(cf.subs, 0) AS number_of_subscribers,
coalesce(cd.posts, 0) AS number_of_posts,
coalesce(cd.comments, 0) AS number_of_comments,
hot_rank (cf.subs, c.published) AS hot_rank
FROM
community c
LEFT JOIN user_ u ON c.creator_id = u.id
LEFT JOIN category cat ON c.category_id = cat.id
LEFT JOIN (
SELECT
p.community_id,
count(DISTINCT p.id) AS posts,
count(DISTINCT ct.id) AS comments
FROM
post p
LEFT JOIN comment ct ON p.id = ct.post_id
GROUP BY
p.community_id) cd ON cd.community_id = c.id
LEFT JOIN (
SELECT
community_id,
count(*) AS subs
FROM
community_follower
GROUP BY
community_id) cf ON cf.community_id = c.id;
CREATE VIEW community_view AS
SELECT
cv.*,
us.user AS user_id,
us.is_subbed::bool AS subscribed
FROM
community_aggregates_view cv
CROSS JOIN LATERAL (
SELECT
u.id AS user,
coalesce(cf.community_id, 0) AS is_subbed
FROM
user_ u
LEFT JOIN community_follower cf ON u.id = cf.user_id
AND cf.community_id = cv.id) AS us
UNION ALL
SELECT
cv.*,
NULL AS user_id,
NULL AS subscribed
FROM
community_aggregates_view cv;
-- The community fast table
CREATE TABLE community_aggregates_fast AS
SELECT
*
FROM
community_aggregates_view;
ALTER TABLE community_aggregates_fast
ADD PRIMARY KEY (id);
CREATE VIEW community_fast_view AS
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 (
SELECT
ca.*
FROM
community_aggregates_fast ca) ac
UNION ALL
SELECT
caf.*,
NULL AS user_id,
NULL AS subscribed
FROM
community_aggregates_fast caf;