discourse/db/migrate/20150108202057_create_bookm...

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class CreateBookmarkActions < ActiveRecord::Migration[4.2]
def up
execute "INSERT INTO user_actions (action_type,
user_id,
target_topic_id,
target_post_id,
acting_user_id,
created_at,
updated_at)
SELECT DISTINCT 3,
pa.user_id,
p.topic_id,
pa.post_id,
pa.user_id,
pa.created_at,
pa.updated_at
FROM post_actions AS pa
INNER JOIN posts AS p ON p.id = pa.post_id AND p.post_number = 1
WHERE NOT EXISTS (SELECT 1 FROM user_actions AS ua WHERE ua.target_post_id = pa.post_id AND ua.action_type = 3 AND ua.user_id = pa.user_id)
AND pa.post_action_type_id = 1
AND pa.deleted_at IS NULL"
end
def down
raise ActiveRecord::IrreversibleMigration
end
end