blob: 0b896108292ee2ac38ad940236f0aee2341446b0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
class RemoveDuplicatedKeys < ActiveRecord::Migration[4.2]
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
|