15 lines
281 B
Ruby
15 lines
281 B
Ruby
|
class RemoveInvalidTopicUser < ActiveRecord::Migration
|
||
|
|
def up
|
||
|
|
execute <<-SQL
|
||
|
|
DELETE FROM topic_users
|
||
|
|
USING topic_users tu
|
||
|
|
LEFT JOIN users u ON u.id = tu.user_id
|
||
|
|
WHERE u.id IS NULL
|
||
|
|
AND topic_users.id = tu.id
|
||
|
|
SQL
|
||
|
|
end
|
||
|
|
|
||
|
|
def down
|
||
|
|
end
|
||
|
|
end
|