discourse/db/migrate/20200409033412_create_bookm...

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# frozen_string_literal: true
class CreateBookmarksFromPostActionBookmarks < ActiveRecord::Migration[6.0]
def up
SiteSetting.enable_bookmarks_with_reminders = true
bookmarks_to_create = []
loop do
# post action type id 1 is :bookmark. we do not need to OFFSET here for
# paging because the WHERE bookmarks.id IS NULL clause handles this effectively,
# because we do not get bookmarks back that have already been inserted
post_action_bookmarks = DB.query(
<<~SQL, type_id: 1
SELECT post_actions.id, post_actions.post_id, posts.topic_id, post_actions.user_id
FROM post_actions
INNER JOIN posts ON posts.id = post_actions.post_id
LEFT JOIN bookmarks ON bookmarks.post_id = post_actions.post_id AND bookmarks.user_id = post_actions.user_id
INNER JOIN topics ON topics.id = posts.topic_id
INNER JOIN users ON users.id = post_actions.user_id
WHERE bookmarks.id IS NULL AND post_action_type_id = :type_id AND post_actions.deleted_at IS NULL AND posts.deleted_at IS NULL
LIMIT 2000
SQL
)
break if post_action_bookmarks.count.zero?
post_action_bookmarks.each do |pab|
now = Time.zone.now
bookmarks_to_create << "(#{pab.topic_id}, #{pab.post_id}, #{pab.user_id}, '#{now}', '#{now}')"
end
create_bookmarks(bookmarks_to_create)
bookmarks_to_create = []
end # loop
end
def down
raise ActiveRecord::IrreversibleMigration
end
def create_bookmarks(bookmarks_to_create)
return if bookmarks_to_create.empty?
# this will ignore conflicts in the bookmarks table so
# if the user already has a post bookmarked in the new way,
# then we don't error and keep on truckin'
#
# we shouldn't have duplicates here at any rate because of
# the above LEFT JOIN but best to be safe knowing this
# won't blow up
#
DB.exec(
<<~SQL
INSERT INTO bookmarks (topic_id, post_id, user_id, created_at, updated_at)
VALUES #{bookmarks_to_create.join(",\n")}
ON CONFLICT DO NOTHING
SQL
)
end
end