ModelSerializer 使用知识点_序列化和反序列化用法区别

1、ModelSerializer  如下

from api_test.errorCode.errorCode import Status
class RelatedbSerializer(serializers.ModelSerializer):
    """
    关联数据库返回JSON参数序列化
    """
    globalHost = serializers.CharField()

    class Meta:
        model = HostRelateDB
        fields = ('id', 'globalHost', 'relateDB_name', 'db_host', 'db_username', 'db_pwd', 'db_port')

    def validate_globalHost(self, globalHost):
        if globalHost:
            globalHost = int(globalHost) if globalHost.isdigit() else globalHost
            if not isinstance(globalHost, int):
                raise serializers.ValidationError("PARAM_NOT_INT")
            try:
                global_host_obj = GlobalHost.objects.get(id=globalHost)
            except ObjectDoesNotExist:
                raise serializers.ValidationError("NOT_FOUND")
        else:
            raise serializers.ValidationError("PARAM_IS_NULL")

        return globalHost

2、序列化用法如下，新增数据

data = JSONParser().parse(request)
serialze = RelatedbSerializer(data=data) #序列化，将json数据传入ModelSerializer  
if serialze.is_valid():
    global_host_obj = GlobalHost.objects.get(id=data["globalHost"])
    serialze.save(globalHost=global_host_obj)  
    return JsonResponse(code=Status.SUCCESS.get_code(), msg=Status.SUCCESS.get_msg(),data=serialze.data)


3、反序列化用法如下，查询数据

globalHost_id = request.GET.get("globalHost")
try:
    page_size = int(request.GET.get("page_size", 20))
    page = int(request.GET.get("page", 1))
except (TypeError, ValueError):
    return JsonResponse(code="999985", msg="page and page_size must be integer!")
if not globalHost_id.isdecimal():
    return JsonResponse(code="999996", msg="参数有误！")
try:
    GlobalHost.objects.get(id=globalHost_id)
except ObjectDoesNotExist:
    return JsonResponse(code="999995", msg="相关host不存在！")
try:
    relateDBObj = HostRelateDB.objects.filter(globalHost_id=globalHost_id)
    paginator = Paginator(relateDBObj, page_size)  # paginator对象
    total = paginator.num_pages  # 总页数
    try:
        obm = paginator.page(page)
    except PageNotAnInteger:
        obm = paginator.page(1)
    except EmptyPage:
        obm = paginator.page(paginator.num_pages)
    serializer = RelatedbSerializer(obm, many=True) # 反序列化，将查询到的model对象传入ModelSerializer  

    return JsonResponse(data={"data": serializer.data,
                              "page": page,
                              "total": total
                              }, code="999999", msg="成功")

4、反序列化对单个对象和列表对象序列化的区别

3中是对多个对象的序列化，单个序列化如下

try:
    obj = AutomationTestTaskSerializer(AutomationTestTask.objects.get(project=project_id)) # 使用get方法取单个对象
    print("obj:",obj)
    return JsonResponse(code="999999", msg="成功！", data=obj.data)

except ObjectDoesNotExist:
    print("ObjectDoesNotExist:")
    return JsonResponse(code="999999", msg="成功！")