Angular invites

This is pretty janky. A slicker way, imho

    def User/Group/Contact
      includes Invitable
    end
    
    def Invitable
      def as_invitable
        invitable_serializer.new(self, root: false).as_json
      end

      def invitable_serializer
        "Invitables::#{class}Serializer".constantize
      end
    end

    @invitables = Queries::VisibleInvitables.new(...).map(&:as_invitable)