docs: public OrganizationModel attachLink(OrganizationModel organizationModel, LinkModel linkModel)
      {
          // check for duplicates
          for (LinkModel existing : organizationModel.getLinks())
          {
              if (existing.equals(linkModel))
              {
                  return organizationModel;
              }
          }
          organizationModel.addLink(linkModel);
          return organizationModel;
      }