discourse/db/migrate/20170831180419_remove_whisp...

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class RemoveWhisperTopicLinks < ActiveRecord::Migration[4.2]
def change
execute <<-SQL
DELETE FROM topic_links
USING topic_links tl
LEFT JOIN posts p ON p.id = tl.post_id
WHERE p.post_type = 4
AND topic_links.id = tl.id
SQL
end
end