docs: def _from_dict(cls, _dict):
          """Initialize a Content object from a json dictionary."""
          args = {}
          if 'contentItems' in _dict:
              args['content_items'] = [
                  ContentItem._from_dict(x) for x in (_dict.get('contentItems'))
              ]
          else:
              raise ValueError(
                  'Required property \'contentItems\' not present in Content JSON'
              )
          return cls(**args)