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class RemoveDuplicatedKeys < ActiveRecord::Migration
def up
select_all("SELECT fingerprint FROM #{quote_table_name(:keys)} GROUP BY fingerprint HAVING COUNT(*) > 1").each do |row|
fingerprint = connection.quote(row['fingerprint'])
execute(%Q{
DELETE FROM #{quote_table_name(:keys)}
WHERE fingerprint = #{fingerprint}
AND id != (
SELECT id FROM (
SELECT max(id) AS id
FROM #{quote_table_name(:keys)}
WHERE fingerprint = #{fingerprint}
) max_ids
)
})
end
end
end
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