如果第一行或第二行属性中的两个属性都为真，这是否正确说明权限应允许读取权限？谢谢
has_permission_on :grant do
to => :read
if_attribute { :grant_application_opens < Date.today :join_by => :and :grant_application_closes > Date.today }
if_attribute :grant_application_enduring => true
end