Django REST Framework嵌套序列化器不會更新

根據Django REST Framework版本3 documentation，爲了創建可寫入嵌套序列化器，您需要編寫自己的create()和update()方法。我有閱讀和寫作的工作，但更新不起作用。例如，如果我將以下數據發送到我的序列化器3次，我最終創建了3個新的Widget。我預計傳遞一個預先存在的id會觸發更新並呼叫update()，但是會調用create()。似乎id被忽略，這是有道理的，因爲它是自動生成的，所以我如何實現這一點？Django REST Framework嵌套序列化器不會更新

我有一種感覺，我錯過了一些明顯的東西，也許在我看來有些額外的處理？

views.py（目前確實粗糙，請原諒）

from rest_framework.decorators import api_view 
from rest_framework.response import Response 

from widget.models import Widget 
from widget.serializers import WidgetSerializer 

@api_view() 
def create(request): 

    data = { 
     "id": 4, 
     "widget_alpha": { 
      "bits": [ 
       { 
        "id": 3, 
        "name": "bit 1", 
        "widget": 4 
       } 
      ], 
      "bobs": [ 
       { 
        "id": 3, 
        "name": "bob 1", 
        "widget": 4 
       } 
      ], 
      "name": "my wid", 
      "widget": 4 
     }, 
     "language": "en", 
     "code": "123" 
    } 

    serializer = WidgetSerializer(data=data) 
    if serializer.is_valid(): 
     serializer.save() 
    else: 
     print serializer.errors 

    return Response({"message": "yay"})

Widget是一個父模型，WidgetAlpha是一個孩子，是由幾個位和鮑勃的。下面的代碼相關的models.py和serializers.py。

models.py

from django.db import models 

class Widget(models.Model): 
    LANGUAGE = (
     ('fr', 'French'), 
     ('en', 'English'), 
    ) 

    language = models.CharField(max_length=2, choices=LANGUAGE) 
    code = models.CharField(max_length=6) 

class WidgetAlpha(models.Model): 
    widget = models.OneToOneField(Widget, primary_key=True, related_name='widget_alpha') 
    name = models.CharField(max_length=6) 

class Bit(models.Model): 

    widget = models.ForeignKey(WidgetAlpha, related_name='bits') 
    name = models.CharField(max_length=6) 

class Bob(models.Model): 

    widget = models.ForeignKey(WidgetAlpha, related_name='bobs') 
    name = models.CharField(max_length=6)

serializers.py

from rest_framework import serializers 

from widget.models import Widget, WidgetAlpha, Bit, Bob 

class BitsSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Bit 

class BobsSerializer(serializers.ModelSerializer): 
    class Meta: 
     model = Bob 

class WidgetAlphaSerializer(serializers.ModelSerializer): 

    bits = BitsSerializer(many=True) 
    bobs = BobsSerializer(many=True) 

    class Meta: 
     model = WidgetAlpha 

class WidgetSerializer(serializers.ModelSerializer): 
    widget_alpha = WidgetAlphaSerializer() 

    class Meta: 
     model = Widget 

    def create(self, validated_data): 
     widget_alpha_data = validated_data.pop('widget_alpha')  
     bits_data = widget_alpha_data.pop('bits') 
     bobs_data = widget_alpha_data.pop('bobs') 

     widget = Widget.objects.create(**validated_data) 
     alpha_widget = WidgetAlpha.objects.create(widget=widget, **widget_alpha_data) 

     for bit_data in bits_data: 
      Bit.objects.create(widget=alpha_widget, **bit_data) 

     for bob_data in bobs_data: 
      Bob.objects.create(widget=alpha_widget, **bob_data) 

     return widget 

    def update(self, instance, validated_data): 
     # never get here :(
     return instance

來源

2016-01-13 redgoose

你可以添加你的看法呢？ – DevilPinky

views.py已被添加 – redgoose

你不要在任何地方調用'update'。如果你想調用一個更新，你需要創建類似如下的串行器對象：'serializer = WidgetSerializer（object，data = data）' – DevilPinky

爲了的WidgetSerializer.update()方法被調用，你需要以不同的實例序列化。

嘗試使用這樣的事情：

widget = Widget.get(pk=something) 

serializer = WidgetSerializer(widget, data=data, partial=True) #you need partial if you want to update only some fields 
if serializer.is_valid(): 
    serializer.save() 
else: 
    print serializer.errors

來源

2016-01-13 17:05:10 DevilPinky

Django REST Framework嵌套序列化器不會更新

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