QuerySet序列化一般可以先写一个公共的常用的解析函数,参考前面的博文《【服务后端】Python序列化对象为Json方法

http://www.cnblogs.com/inns/p/5507012.html

所有字段按照其类型来解析,外键返回id即可

后面介绍一些特殊序列化需求及实现

 

User和Class表,以及ClassUserTemp表,

1.1 User表

【服务后端】Django 返回的QuerySet序列化

 

2.2 Class表

【服务后端】Django 返回的QuerySet序列化

3.3 ClassUserTemp表

【服务后端】Django 返回的QuerySet序列化

 

2、 ClassUserTemp查询

经常会出现查询ClassUserTemp表的场景

例如pUserClasses = ClassUserTemp.objects.filter(idClass__Owner=lUser).values("idClass","idUser")

 

返回给APP的Json数据需要序列化,我们一般都会建立一个公共的序列化函数,ClassUserTemp序列化之后返回给APP的就是Class和User的Id。

return JsonResponse(pUserClasses )

 

但有时候需要定制化返回给APP一些信息,例如把User和Class的名称也带上

2.1 序列化之后赋值(效率低)

pUserClasses = ClassUserTemp.objects.filter(idClass__Owner=lUser)

pUserClassesJson = pUserClasses.values("idClass","idUser")

for pUserClasseJson in pUserClassesJson:
           pUserClasseJson["idClass_Name"] = pUserClasses.filter(idClass__id=pUserClasseJson["idClass"])[0].idClass.ClassName
           pUserClasseJson["idUser_Name"] = pUserClasses.filter(idUser__id=pUserClasseJson["idUser"])[0].idUser.UserName

return JsonResponse(pUserClasseJson)

2.2 从QuerySet序列化(比上一方法效率高)

pUserClasses = ClassUserTemp.objects.filter(idClass__Owner=lUser)
                pUserClassesJson = []
                for pUserClass in pUserClasses:
                    pUserClassesJson.append({
                        "idClass":pUserClass.idClass.id,
                        "idClass_Name":pUserClass.idClass.ClassName,
                        "idUser":pUserClass.idUser.id,
                        "idUser_Name":pUserClass.idUser.UserName
                        })
                return JsonResponse(pUserClasseJson)

 

3 查询返回结果

GET http://127.0.0.1:8000/JoinClass/?OwnerFlag=my

-- response --
200 OK
Date:  Fri, 20 May 2016 03:20:02 GMT
Server:  WSGIServer/0.1 Python/2.7.10
Vary:  Cookie
X-Frame-Options:  SAMEORIGIN
Content-Type:  application/json
Set-Cookie:  csrftoken=MA0QfFh87zllpjQT0BLuPB16F7WAOiH8; expires=Fri, 19-May-2017 03:20:02 GMT; Max-Age=31449600; Path=/

[{"idUser": "2", "idClass": "5", "idClass_Name": "123", "idUser_Name": "in"}, {"idUser": "2", "idClass": "6", "idClass_Name": "\u4e00\u5e74\u7ea7\u4e00\u73ed", "idUser_Name": "in"}]