code: def _bind_to_schema(self, field_name, schema):
          
          self.parent = self.parent or schema
          self.name = self.name or field_name
docs: Update field with values from its parent schema. Called by
              :meth:`_bind_field<marshmallow.Schema._bind_field>`.
  
          :param str field_name: Field name set in schema.
          :param Schema schema: Parent schema.