code: def load_table_data(self):
          
          # We only want the data to be loaded once, so we track if we have...
          if not self._table_data_loaded:
              for table_name, table in self._tables.items():
                  # Fetch the data function.
                  func_name = "get_%s_data" % table_name
                  data_func = getattr(self, func_name, None)
                  if data_func is None:
                      cls_name = self.__class__.__name__
                      raise NotImplementedError(
                          "You must define a %(func_name)s method on"
                          " %(cls_name)s."
                          % {'func_name': func_name, 'cls_name': cls_name})
  
                  # Load the data.
                  table.data = data_func()
                  table._meta.has_prev_data = self.has_prev_data(table)
                  table._meta.has_more_data = self.has_more_data(table)
              # Mark our data as loaded so we don't run the loaders again.
              self._table_data_loaded = True
docs: Calls the ``get_{{ table_name }}_data`` methods for each table class.
  
          When returning, the loaded data is set on the tables.