docs: def initialize_fields(self):
          """
          The dict self.base_fields is a model instance at this point.
          Turn it into an instance attribute on this meta class.
          Also intitialize any other special fields if needed in sub-classes.
  
          :return: None
          """
          for field in dir(self):
              obj = getattr(self, field)
              if isinstance(obj, Field):
                  self._meta.fields[field] = obj