如何通过 Django Rest Framework 返回嵌套的 json

Posted 2023-02-19

【中文标题】如何通过 Django Rest Framework 返回嵌套的 json

【英文标题】：How to return nested json by Django Rest Framework

【发布时间】：2020-12-30 16:42:12

【问题描述】：

我在 postgres 数据库中有这样的数据

我想创建rest api来返回这样的嵌套json

[

    "machine": "MC1",
    "work"   : [
                 
                    "title": "21TCE20200910",
                    "subTitle1": "INSERT CORE",
                    "subTitle2": "P20200910-001",
                    "subTitle3": "DRAW20200910",
                    "status": 0,
                    "delay": 2
                 ,
                 
                    "title": "21TCE20200910",
                    "subTitle1": "INSERT CORE",
                    "subTitle2": "P20200910-001",
                    "subTitle3": "DRAW20200912",
                    "status": 1,
                    "delay": 1
                 
               ]
    
,

    "machine": "MC2",
    "work"   : [
                 
                    "title": "21TCE20200911",
                    "subTitle1": "SCREW",
                    "subTitle2": "P20200910-001",
                    "subTitle3": "DRAW20200910",
                    "status": 1,
                    "delay": 2
                 
               ]
    
,

    "machine": "MC3",
    "work"   : [
                 
                    "title": "21TCE20200913",
                    "subTitle1": "INSERT FIX",
                    "subTitle2": "P20200910-001",
                    "subTitle3": "DRAW20200910",
                    "status": 0,
                    "delay": 1
                 
               ]
    

]

目前我只能为每条记录返回正常的 json，但我想像上面一样分组并返回嵌套的 json，任何帮助将不胜感激

以下是我的代码 模型.py

从 django.db 导入模型 类 MachineSchedule(models.Model): machine = models.CharField(max_length=255) 标题 = models.CharField(max_length=255) subTitle1 = models.CharField(max_length=255) subTitle2 = models.CharField(max_length=255) subTitle3 = models.CharField(max_length=255) 状态 = 模型.IntegerField(1) 延迟 = 模型.IntegerField(1)

views.py

从 django.shortcuts 导入渲染 从 rest_framework 导入泛型 从 .models 导入 MachineSchedule 从 .serializers 导入 MachineScheduleSerializer 类 MachineScheduleListAPIView(generics.ListCreateAPIView): serializer_class= MachineScheduleSerializer 模型 = MachineSchedule 字段 = '__all__'

序列化器.py

从 rest_framework 导入序列化程序 从 .models 导入 MachineAllocate 类 MachineAllocateSerializer(serializers.ModelSerializer): 元类： 型号 = MachineAllocate 字段 = '__all__'

【问题讨论】：

你能显示你试过的代码吗？

我已经把它贴在下面了，谢谢！

答案不是放置代码的地方。请将其移至您的问题。

【参考方案1】：

#models
class Work(models.Model):
title   = models.CharField(max_length=255)
subTitle1 = models.CharField(max_length=255)
subTitle2 = models.CharField(max_length=255)
subTitle3 = models.CharField(max_length=255)
status = models.IntegerField(1)
delay = models.IntegerField(1)

class MachineSchedule(models.Model):
machine = models.CharField(max_length=255)
work = models.ForeignKey(Work, on_delete=models.CASCADE, related_name='work')

#serializer
from rest_framework import serializers
from .models import *

class WorkSerializer(serializers.ModelSerializer):
class Meta:
    model = MachineAllo
    fields = '__all__'

class MachineScheduleSerializer(serializers.ModelSerializer):
work = WorkSerializer(many=True)
class Meta:
    model = MachineAllo
    fields = '__all__'

#views
from rest_framework import generics
from .models import MachineSchedule
from .serializers import MachineScheduleSerializer

class MachineScheduleListAPIView(generics.ListCreateAPIView):
serializer_class = MachineScheduleSerializer
model = MachineSchedule
fields = '__all__'

【讨论】：

感谢您的回答，但是当打开 api ProgrammingError 列 app_mc_schedule_machineschedule.work_id 不存在时会显示这样的错误