discourse/db/migrate/20130809160751_fix_seen_not...

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class FixSeenNotificationIds < ActiveRecord::Migration[4.2]
def up
# There was an error where `seen_notification_id` was being updated incorrectly.
# This tries to fix some of the bad data.
execute "UPDATE users SET
seen_notification_id = COALESCE((SELECT MAX(notifications.id)
FROM notifications
WHERE user_id = users.id AND created_at <= users.last_seen_at), 0)"
end
def down
end
end