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class AddForeignKeyFromNotificationSettingsToUsers < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
class NotificationSetting < ActiveRecord::Base
self.table_name = 'notification_settings'
include EachBatch
end
class User < ActiveRecord::Base
self.table_name = 'users'
end
DOWNTIME = false
disable_ddl_transaction!
def up
NotificationSetting.each_batch(of: 1000) do |batch|
batch.where('NOT EXISTS (?)', User.select(1).where('users.id = notification_settings.user_id'))
.delete_all
end
add_concurrent_foreign_key(:notification_settings, :users, column: :user_id, on_delete: :cascade)
end
def down
remove_foreign_key(:notification_settings, column: :user_id)
end
end
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