django 使用时自定义fields的ModelSerializerield

class CustomFieldModelSerializer(serializers.ModelSerializer):
    """
    可在使用时自定义fields 默认为__all__
    serializer = CustomFieldModelSerializer(fields=(field1, field2,...))
    """
    def __init__(self, fields=None, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if isinstance(fields, str):
            fields = (fields,)
        if fields:
            self.meta.fields = fields

    class meta:
        model = SKU
        fields = '__all__'