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class RemoveDuplicatedNotificationSettings < ActiveRecord::Migration[4.2]
def up
duplicates = exec_query(%Q{
SELECT user_id, source_type, source_id
FROM notification_settings
GROUP BY user_id, source_type, source_id
HAVING COUNT(*) > 1
})
duplicates.each do |row|
uid = row['user_id']
stype = connection.quote(row['source_type'])
sid = row['source_id']
execute(%Q{
DELETE FROM notification_settings
WHERE user_id = #{uid}
AND source_type = #{stype}
AND source_id = #{sid}
AND id != (
SELECT id FROM (
SELECT min(id) AS id
FROM notification_settings
WHERE user_id = #{uid}
AND source_type = #{stype}
AND source_id = #{sid}
) min_ids
)
})
end
end
end
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