fields.py 文件源码

def _validate_choices(self, value):
        if isinstance(value, dict):
            # If the field has not been dereferenced, it is still a dict
            # of class and DBRef
            value = value.get('_cls')
        elif isinstance(value, Document):
            value = value._class_name
        super(GenericReferenceField, self)._validate_choices(value)