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Add rake task for reordering posts by creation_date

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Gerhard Schlager
2018-03-29 14:42:41 +02:00
parent 3287ac77e0
commit cf9965fd54
2 changed files with 95 additions and 0 deletions
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91
lib/tasks/posts.rake
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@ -274,3 +274,94 @@ task 'posts:refresh_emails', [:topic_id] => [:environment] do |_, args|
puts "", "Done. #{updated} posts updated.", ""
end
desc 'Reorders all posts based on their creation_date'
task 'posts:reorder_posts' => :environment do
Post.transaction do
# update sort_order and flip post_number to prevent
# unique constraint violations when updating post_number
Post.exec_sql(<<~SQL)
WITH ordered_posts AS (
SELECT
id,
ROW_NUMBER()
OVER (
PARTITION BY topic_id
ORDER BY created_at, post_number ) AS new_post_number
FROM posts
)
UPDATE posts AS p
SET sort_order = o.new_post_number,
post_number = p.post_number * -1
FROM ordered_posts AS o
WHERE p.id = o.id AND
p.post_number <> o.new_post_number
SQL
Notification.exec_sql(<<~SQL)
UPDATE notifications AS x
SET post_number = p.sort_order
FROM posts AS p
WHERE x.topic_id = p.topic_id AND
x.post_number = ABS(p.post_number) AND
p.post_number < 0
SQL
PostTiming.exec_sql(<<~SQL)
UPDATE post_timings AS x
SET post_number = x.post_number * -1
FROM posts AS p
WHERE x.topic_id = p.topic_id AND
x.post_number = ABS(p.post_number) AND
p.post_number < 0;
UPDATE post_timings AS t
SET post_number = p.sort_order
FROM posts AS p
WHERE t.topic_id = p.topic_id AND
t.post_number = p.post_number AND
p.post_number < 0;
SQL
Post.exec_sql(<<~SQL)
UPDATE posts AS x
SET reply_to_post_number = p.sort_order
FROM posts AS p
WHERE x.topic_id = p.topic_id AND
x.reply_to_post_number = ABS(p.post_number) AND
p.post_number < 0;
SQL
TopicUser.exec_sql(<<~SQL)
UPDATE topic_users AS x
SET last_read_post_number = p.sort_order
FROM posts AS p
WHERE x.topic_id = p.topic_id AND
x.last_read_post_number = ABS(p.post_number) AND
p.post_number < 0;
UPDATE topic_users AS x
SET highest_seen_post_number = p.sort_order
FROM posts AS p
WHERE x.topic_id = p.topic_id AND
x.highest_seen_post_number = ABS(p.post_number) AND
p.post_number < 0;
UPDATE topic_users AS x
SET last_emailed_post_number = p.sort_order
FROM posts AS p
WHERE x.topic_id = p.topic_id AND
x.last_emailed_post_number = ABS(p.post_number) AND
p.post_number < 0;
SQL
# finally update the post_number
Post.exec_sql(<<~SQL)
UPDATE posts
SET post_number = sort_order
WHERE post_number < 0
SQL
end
puts "", "Done.", ""
end