code: def path(self, which=None):
          
          if which in ('add_products', 'remove_products'):
              return '{0}/{1}'.format(
                  super(SyncPlan, self).path(which='self'),
                  which
              )
          return super(SyncPlan, self).path(which)
docs: Extend ``nailgun.entity_mixins.Entity.path``.
  
          The format of the returned path depends on the value of ``which``:
  
          add_products
              /katello/api/v2/organizations/:organization_id/sync_plans/:sync_plan_id/add_products
          remove_products
              /katello/api/v2/organizations/:organization_id/sync_plans/:sync_plan_id/remove_products