16 lines
574 B
Ruby
16 lines
574 B
Ruby
class AddUniqueIndexOnNotifications < ActiveRecord::Migration
|
|
tag :postdeploy
|
|
|
|
def self.up
|
|
return unless Shard.current.default?
|
|
# the excess subquery is necessary to avoid error 1093 on mysql
|
|
Notification.where("id NOT IN (SELECT * FROM (SELECT MIN(id) FROM notifications GROUP BY name) x)").delete_all
|
|
add_index :notifications, [:name], :unique => true, :name => "index_notifications_unique_on_name"
|
|
end
|
|
|
|
def self.down
|
|
return unless Shard.current.default?
|
|
remove_index :notifications, :name => "index_notifications_unique_on_name"
|
|
end
|
|
end
|