class DeviceSerializer(serializers.ModelSerializer):
    """
    设备序列化
    """
    cabinet = serializers.SerializerMethodField()

    def get_cabinet(self, obj):
        cabinets = Cabinet.objects.filter(id=obj.cabinet_id)
        if cabinets is not None and len(cabinets) > 0:
            return CabinetSerializer(cabinets[0]).data
        else:
            return ""

    class Meta:
        model = Device
        fields = ('id', 'device_name', 'device_type', 'brand', 'model',
                  'hardware', 'cabinet_id', 'cabinet', 'created_time', 'modified_time'