ModelSerializer point of use _ serialization and de-serialization knowledge usage difference

1, ModelSerializer follows

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:
                = GlobalHost.objects.get global_host_obj (ID = globalHost) 
            the except of ObjectDoesNotExist: 
                The raise serializers.ValidationError ( "NOT_FOUND") 
        the else: 
            The raise serializers.ValidationError ( "PARAM_IS_NULL") 

        return globalHost 

2, the following sequence of usage, new data

. Data = JSONParser () the parse (Request) 
serialze = RelatedbSerializer (Data = Data) # serialized data into the json ModelSerializer  
 IF serialze.is_valid (): 
    global_host_obj = GlobalHost.objects.get (Data ID = [ "globalHost" ]) 
    serialze.save (globalHost = global_host_obj)   
    return jsonResponse (code = Status.SUCCESS.get_code (), MSG = Status.SUCCESS.get_msg (), data = serialze.data) 


. 3, the following usage deserialization, query data

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 target 
    total = paginator.num_pages # Pages
    the try: 
        OBM = paginator.page (Page) 
    the except PageNotAnInteger: 
        OBM paginator.page = (. 1) 
    the except EmptyPage: 
        OBM = paginator.page (paginator.num_pages) 
    Serializer = RelatedbSerializer (OBM, MANY = True) # deserialization, the queries to the model objects passed ModelSerializer  

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

4, a single object to deserialize and serialize the object list distinction

3 is serialized, serialization of a plurality of single objects as follows

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！")