code: def path(self, which=None):
          
          if which in (
                  'clone',
                  'puppetclass_ids',
                  'smart_class_parameters',
                  'smart_variables'
          ):
              return '{0}/{1}'.format(
                  super(HostGroup, self).path(which='self'),
                  which
              )
          return super(HostGroup, self).path(which)
docs: Extend ``nailgun.entity_mixins.Entity.path``.
          The format of the returned path depends on the value of ``which``:
  
          clone
              /api/hostgroups/:hostgroup_id/clone
          puppetclass_ids
              /api/hostgroups/:hostgroup_id/puppetclass_ids
          smart_class_parameters
              /api/hostgroups/:hostgroup_id/smart_class_parameters
          smart_class_variables
              /api/hostgroups/:hostgroup_id/smart_variables
  
          Otherwise, call ``super``.