code: def path(self, which=None):
          
          if which in ('incremental_update', 'promote'):
              prefix = 'base' if which == 'incremental_update' else 'self'
              return '{0}/{1}'.format(
                  super(ContentViewVersion, self).path(prefix),
                  which
              )
          return super(ContentViewVersion, self).path(which)
docs: Extend ``nailgun.entity_mixins.Entity.path``.
  
          The format of the returned path depends on the value of ``which``:
  
          incremental_update
              /content_view_versions/incremental_update
          promote
              /content_view_versions/<id>/promote
  
          ``super`` is called otherwise.