serializers.py 文件源码

def __init__(self, *args, **kwargs):
        """ Dynamically add the USERNAME_FIELD to self.fields. """
        super().__init__(*args, **kwargs)

        self.fields[self.username_field] = serializers.CharField(
            required=False)
        self.fields['password'] = PasswordField(
            write_only=True, required=False)