code: def assign(self, objects, nurest_object_type, async=False, callback=None, commit=True):
          
  
          ids = list()
  
          for nurest_object in objects:
              ids.append(nurest_object.id)
  
          url = self.get_resource_url_for_child_type(nurest_object_type)
          request = NURESTRequest(method=HTTP_METHOD_PUT, url=url, data=ids)
          user_info = {'nurest_objects': objects, 'commit': commit}
  
          if async:
              return self.send_request(request=request,
                                       async=async,
                                       local_callback=self._did_perform_standard_operation,
                                       remote_callback=callback,
                                       user_info=user_info)
          else:
              connection = self.send_request(request=request,
                                             user_info=user_info)
  
              return self._did_perform_standard_operation(connection)
docs: Reference a list of objects into the current resource
  
              Args:
                  objects (list): list of NURESTObject to link
                  nurest_object_type (type): Type of the object to link
                  callback (function): Callback method that should be fired at the end
  
              Returns:
                  Returns the current object and the connection (object, connection)
  
              Example:
                  >>> entity.assign([entity1, entity2, entity3], NUEntity) # entity1, entity2 and entity3 are now part of the entity