lemmy/migrations/2020-03-06-202329_add_post_.../up.sql

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-- Add the columns
ALTER TABLE post
ADD COLUMN embed_title text;
ALTER TABLE post
ADD COLUMN embed_description text;
ALTER TABLE post
ADD COLUMN embed_html text;
ALTER TABLE post
ADD COLUMN thumbnail_url text;
-- Regenerate the views
-- Adds a newest_activity_time for the post_views, in order to sort by newest comment
DROP VIEW post_view;
DROP VIEW post_mview;
DROP MATERIALIZED VIEW post_aggregates_mview;
DROP VIEW post_aggregates_view;
-- regen post view
CREATE VIEW post_aggregates_view 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), (
CASE WHEN (p.published < ('now'::timestamp - '1 month'::interval)) THEN
p.published -- Prevents necro-bumps
ELSE
greatest (c.recent_comment_time, p.published)
END)) AS hot_rank,
(
CASE WHEN (p.published < ('now'::timestamp - '1 month'::interval)) THEN
p.published -- Prevents necro-bumps
ELSE
greatest (c.recent_comment_time, p.published)
END) AS newest_activity_time
FROM
post p
LEFT JOIN post_like pl ON p.id = pl.post_id
LEFT JOIN (
SELECT
post_id,
max(published) AS recent_comment_time
FROM
comment
GROUP BY
1) c ON p.id = c.post_id
GROUP BY
p.id,
c.recent_comment_time;
CREATE MATERIALIZED VIEW post_aggregates_mview AS
SELECT
*
FROM
post_aggregates_view;
CREATE UNIQUE INDEX idx_post_aggregates_mview_id ON post_aggregates_mview (id);
CREATE VIEW post_view AS
with all_post AS (
SELECT
pa.*
FROM
post_aggregates_view pa
)
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;
CREATE VIEW post_mview AS
with all_post AS (
SELECT
pa.*
FROM
post_aggregates_mview pa
)
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;