serializers.py 文件源码

def validate(self, data):
        """
        Object level validation, all descendants should call this via Super()
        if it is overriden.

        Validates that only fields available in writable_fields are being written
        """
        # Data may be stripped of invalid fields before it gets here, check
        if len(data.keys()) == 0:
            raise serializers.ValidationError("Invalid data")

        # Get a list of writable fields
        writable_fields = self.get_writable_fields()
        invalid_fields = [x for x in data.keys() if x not in writable_fields]
        if len(invalid_fields) > 0:
            raise serializers.ValidationError(f"The following fields are not writable: {', '.join(invalid_fields)}")
        return data