lemmy/migrations/2020-01-13-025151_create_materialized_views/down.sql

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-- functions and triggers
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DROP TRIGGER refresh_user ON user_;
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DROP FUNCTION refresh_user ();
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DROP TRIGGER refresh_post ON post;
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DROP FUNCTION refresh_post ();
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DROP TRIGGER refresh_post_like ON post_like;
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DROP FUNCTION refresh_post_like ();
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DROP TRIGGER refresh_community ON community;
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DROP FUNCTION refresh_community ();
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DROP TRIGGER refresh_community_follower ON community_follower;
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DROP FUNCTION refresh_community_follower ();
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DROP TRIGGER refresh_community_user_ban ON community_user_ban;
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DROP FUNCTION refresh_community_user_ban ();
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DROP TRIGGER refresh_comment ON comment;
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DROP FUNCTION refresh_comment ();
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DROP TRIGGER refresh_comment_like ON comment_like;
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DROP FUNCTION refresh_comment_like ();
-- post
-- Recreate the view
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DROP VIEW post_view;
CREATE VIEW post_view AS
with all_post AS (
SELECT
p.*,
(
SELECT
u.banned
FROM
user_ u
WHERE
p.creator_id = u.id) AS banned,
(
SELECT
cb.id::bool
FROM
community_user_ban cb
WHERE
p.creator_id = cb.user_id
AND p.community_id = cb.community_id) AS banned_from_community,
(
SELECT
name
FROM
user_
WHERE
p.creator_id = user_.id) AS creator_name,
(
SELECT
avatar
FROM
user_
WHERE
p.creator_id = user_.id) AS creator_avatar,
(
SELECT
name
FROM
community
WHERE
p.community_id = community.id) AS community_name,
(
SELECT
removed
FROM
community c
WHERE
p.community_id = c.id) AS community_removed,
(
SELECT
deleted
FROM
community c
WHERE
p.community_id = c.id) AS community_deleted,
(
SELECT
nsfw
FROM
community c
WHERE
p.community_id = c.id) AS community_nsfw,
(
SELECT
count(*)
FROM
comment
WHERE
comment.post_id = p.id) AS number_of_comments,
coalesce(sum(pl.score), 0) AS score,
count(
CASE WHEN pl.score = 1 THEN
1
ELSE
NULL
END) AS upvotes,
count(
CASE WHEN pl.score = - 1 THEN
1
ELSE
NULL
END) AS downvotes,
hot_rank (coalesce(sum(pl.score), 0), p.published) AS hot_rank
FROM
post p
LEFT JOIN post_like pl ON p.id = pl.post_id
GROUP BY
p.id
)
SELECT
ap.*,
u.id AS user_id,
coalesce(pl.score, 0) AS my_vote,
(
SELECT
cf.id::bool
FROM
community_follower cf
WHERE
u.id = cf.user_id
AND cf.community_id = ap.community_id) AS subscribed,
(
SELECT
pr.id::bool
FROM
post_read pr
WHERE
u.id = pr.user_id
AND pr.post_id = ap.id) AS read,
(
SELECT
ps.id::bool
FROM
post_saved ps
WHERE
u.id = ps.user_id
AND ps.post_id = ap.id) AS saved
FROM
user_ u
CROSS JOIN all_post ap
LEFT JOIN post_like pl ON u.id = pl.user_id
AND ap.id = pl.post_id
UNION ALL
SELECT
ap.*,
NULL AS user_id,
NULL AS my_vote,
NULL AS subscribed,
NULL AS read,
NULL AS saved
FROM
all_post ap;
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DROP VIEW post_mview;
DROP MATERIALIZED VIEW post_aggregates_mview;
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DROP VIEW post_aggregates_view;
-- user
DROP MATERIALIZED VIEW user_mview;
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DROP VIEW user_view;
CREATE VIEW user_view AS
SELECT
id,
name,
avatar,
email,
fedi_name,
admin,
banned,
show_avatars,
send_notifications_to_email,
published,
(
SELECT
count(*)
FROM
post p
WHERE
p.creator_id = u.id) AS number_of_posts,
(
SELECT
coalesce(sum(score), 0)
FROM
post p,
post_like pl
WHERE
u.id = p.creator_id
AND p.id = pl.post_id) AS post_score,
(
SELECT
count(*)
FROM
comment c
WHERE
c.creator_id = u.id) AS number_of_comments,
(
SELECT
coalesce(sum(score), 0)
FROM
comment c,
comment_like cl
WHERE
u.id = c.creator_id
AND c.id = cl.comment_id) AS comment_score
FROM
user_ u;
-- community
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DROP VIEW community_mview;
DROP MATERIALIZED VIEW community_aggregates_mview;
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DROP VIEW community_view;
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DROP VIEW community_aggregates_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
avatar
FROM
user_ u
WHERE
c.creator_id = u.id) AS creator_avatar,
(
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;
-- reply and comment view
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DROP VIEW reply_view;
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DROP VIEW user_mention_view;
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DROP VIEW comment_view;
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DROP VIEW comment_mview;
DROP MATERIALIZED VIEW comment_aggregates_mview;
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DROP VIEW comment_aggregates_view;
CREATE VIEW comment_view AS
with all_comment AS (
SELECT
c.*,
(
SELECT
community_id
FROM
post p
WHERE
p.id = c.post_id),
(
SELECT
u.banned
FROM
user_ u
WHERE
c.creator_id = u.id) AS banned,
(
SELECT
cb.id::bool
FROM
community_user_ban cb,
post p
WHERE
c.creator_id = cb.user_id
AND p.id = c.post_id
AND p.community_id = cb.community_id) AS banned_from_community,
(
SELECT
name
FROM
user_
WHERE
c.creator_id = user_.id) AS creator_name,
(
SELECT
avatar
FROM
user_
WHERE
c.creator_id = user_.id) AS creator_avatar,
coalesce(sum(cl.score), 0) AS score,
count(
CASE WHEN cl.score = 1 THEN
1
ELSE
NULL
END) AS upvotes,
count(
CASE WHEN cl.score = - 1 THEN
1
ELSE
NULL
END) AS downvotes
FROM
comment c
LEFT JOIN comment_like cl ON c.id = cl.comment_id
GROUP BY
c.id
)
SELECT
ac.*,
u.id AS user_id,
coalesce(cl.score, 0) AS my_vote,
(
SELECT
cs.id::bool
FROM
comment_saved cs
WHERE
u.id = cs.user_id
AND cs.comment_id = ac.id) AS saved
FROM
user_ u
CROSS JOIN all_comment ac
LEFT JOIN comment_like cl ON u.id = cl.user_id
AND ac.id = cl.comment_id
UNION ALL
SELECT
ac.*,
NULL AS user_id,
NULL AS my_vote,
NULL AS saved
FROM
all_comment ac;
CREATE VIEW reply_view AS
with closereply AS (
SELECT
c2.id,
c2.creator_id AS sender_id,
c.creator_id AS recipient_id
FROM
comment c
INNER JOIN comment c2 ON c.id = c2.parent_id
WHERE
c2.creator_id != c.creator_id
-- Do union where post is null
UNION
SELECT
c.id,
c.creator_id AS sender_id,
p.creator_id AS recipient_id
FROM
comment c,
post p
WHERE
c.post_id = p.id
AND c.parent_id IS NULL
AND c.creator_id != p.creator_id
)
SELECT
cv.*,
closereply.recipient_id
FROM
comment_view cv,
closereply
WHERE
closereply.id = cv.id;
-- user mention
CREATE VIEW user_mention_view AS
SELECT
c.id,
um.id AS user_mention_id,
c.creator_id,
c.post_id,
c.parent_id,
c.content,
c.removed,
um.read,
c.published,
c.updated,
c.deleted,
c.community_id,
c.banned,
c.banned_from_community,
c.creator_name,
c.creator_avatar,
c.score,
c.upvotes,
c.downvotes,
c.user_id,
c.my_vote,
c.saved,
um.recipient_id
FROM
user_mention um,
comment_view c
WHERE
um.comment_id = c.id;