lemmy/migrations/2019-04-03-155309_create_comment_view/up.sql

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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,
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
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)
SELECT
cv.*,
closereply.recipient_id
FROM
comment_view cv,
closereply
WHERE
closereply.id = cv.id;
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