code: def create_for_placeholder(self, placeholder, sort_order=1, language_code=None, **kwargs):
          
          if language_code is None:
              # Could also use get_language() or appsettings.FLUENT_CONTENTS_DEFAULT_LANGUAGE_CODE
              # thus avoid the risk of performing an extra query here to the parent.
              # However, this identical behavior to BaseContentItemFormSet,
              # and the parent can be set already via Placeholder.objects.create_for_object()
              language_code = get_parent_language_code(placeholder.parent)
  
          obj = self.create(
              placeholder=placeholder,
              parent_type_id=placeholder.parent_type_id,
              parent_id=placeholder.parent_id,
              sort_order=sort_order,
              language_code=language_code,
              **kwargs
          )
  
          # Fill the reverse caches
          obj.placeholder = placeholder
          parent = getattr(placeholder, '_parent_cache', None)  # by GenericForeignKey (_meta.virtual_fields[0].cache_attr)
          if parent is not None:
              obj.parent = parent
  
          return obj
docs: Create a Content Item with the given parameters
  
          If the language_code is not provided, the language code of the parent will be used.
          This may perform an additional database query, unless
          the :class:`~fluent_contents.models.managers.PlaceholderManager` methods were used to construct the object,
          such as :func:`~fluent_contents.models.managers.PlaceholderManager.create_for_object`
          or :func:`~fluent_contents.models.managers.PlaceholderManager.get_by_slot`