code: def create_many(self, records, joinings=None):
          
          if joinings is None:
              joinings = []
  
          instances = []
  
          for key, record in enumerate(records):
              instances.append(self.create(record), joinings[key], False)
  
          self.touch_if_touching()
  
          return instances
docs: Create a list of new instances of the related model.