當序列化類MATE中定義了depth時，這個序列化類中引用欄位（外來鍵）則自動變為只讀，所以進行更新或者建立操作的時候不能使用此序列化類

具體方法是這樣的分別定義兩個序列化類，判斷request的方法並選擇，直接上程式碼：

serializers.py

# ==== 一旦有了depth，引用的欄位就變為只讀了 ====
class GetSetSerializer(serializers.ModelSerializer):

    class Meta:
        model = Set
        fields = '__all__'
        depth = 1
 



# ==== 這個序列化類沒有depth ====
class UpdateSetSerializer(serializers.ModelSerializer):

    class Meta:
        model = Set
        fields = '__all__'

views.py

class SetViewSet(viewsets.ModelViewSet):
    """
    A viewset that provides default `create()`, `retrieve()`, `update()`,
    `partial_update()`, `destroy()` and `list()` actions.
    """
 

    queryset = Set.objects.all()
    filter_backends = (DjangoFilterBackend, OrderingFilter)
    filter_fields = ('production__name',
                     'available_zone__name',
                     'trash')

    # 此處區分請求的HTTP1.1方法
    def get_serializer_class(self):
        serializer_class = self.serializer_class
        if
 
 self.request.method in ('PUT', 'PATCH'):
            serializer_class = UpdateSetSerializer
        if self.request.method == 'GET':
            serializer_class = GetSetSerializer
        return serializer_class

完美解決
思考：當然這個也可以通過過載