code: public OrganizationModel attachOrganization(OrganizationModel organizationModel, ArchiveModel archiveModel)
      {
          for (OrganizationModel existingOrganizationModel : archiveModel.getOrganizationModels())
          {
              if (existingOrganizationModel.equals(organizationModel))
                  return organizationModel;
          }
          organizationModel.addArchiveModel(archiveModel);
          return organizationModel;
      }
docs: This method just attaches the {@link OrganizationModel} to the {@link FileModel}. It will only do so if this link is not already
  present.