def add_users(users)
      users.each do |user|
        unless @users_by_href.has_key?(user.href)
          @users_by_href[user.href] = RsUserPolicy::User.new(user)
        end
      end
    end
def add_users(users)
      users.each do |user|
        unless @users_by_href.has_key?(user.href)
          @users_by_href[user.href] = RsUserPolicy::User.new(user)
        end
      end
    end
Adds users to this collection only if the collection does not already
 include the specified users.  The users RightScale API href is used
 as the unique identifier for deduplication

 @param [Array<RightApi::ResourceDetail>] users An array of RightAPI::ResourceDetail for the resource type "user"