docs: def update_sample_for_autocreated_cohorts(instance, created, **kwargs):
      "Manages adding/removing samples from autocreated cohorts."
  
      # World
      lookup = {'batch': None, 'project': None, 'autocreated': True,
                'name': 'World'}
      try:
          world_cohort = Cohort.objects.get(**lookup)
      except Cohort.DoesNotExist:
          if getattr(settings, 'VARIFY_AUTO_CREATE_COHORT', True):
              world_cohort = Cohort(**lookup)
              world_cohort.save()
          else:
              log.info("World cohort was not found and was not created because "
                       "VARIFY_AUTO_CREATE_COHORT setting is False.")
              return
  
      project = instance.project
  
      # Project
      lookup = {'batch': None, 'project': project, 'autocreated': True}
      try:
          project_cohort = Cohort.objects.get(**lookup)
      except Cohort.DoesNotExist:
          project_cohort = Cohort(name=unicode(project), **lookup)
          project_cohort.save()
  
      if instance.published:
          world_cohort.add(instance, added=False)
          project_cohort.add(instance, added=False)
      else:
          world_cohort.remove(instance, delete=True)
          project_cohort.remove(instance, delete=True)