def pending_membership_invites
      @pending_membership_invites ||= Membership.inactive
                                                .with_member_id(member_id: guid)
                                                .joins(:group)
                                                .merge(Group.private)
    end
def pending_membership_invites
      @pending_membership_invites ||= Membership.inactive
                                                .with_member_id(member_id: guid)
                                                .joins(:group)
                                                .merge(Group.private)
    end
Returns a collection of pending {Socializer::Membership memberships}
 invites

 @return [Socializer::Membership] Returns a collection of
 {Socializer::Membership memberships}