如何在ModelSerializer中请求参数

Question

我需要使用请求参数返回一些计算值。看来我需要从ModelSerializer内部访问请求参数。我该怎么办？

class PostSerializer(serializers.ModelSerializer):

    owner = UserSerializer()
    spot = SpotSerializer()
    is_login_user_favorite = serializers.SerializerMethodField()

    class Meta:
        model = Post
        fields = '__all__'
        read_only_fields = ('owner',)

    def get_is_login_user_favorite(self, validated_date):
        return True # I need change this dynamically

class PostListAPIView(generics.ListAPIView):
    serializer_class = serializers.PostSerializer
    queryset = Post.objects.all().order_by('-pk')
    permission_classes = [IsAuthenticated]

Answer 1

您可以通过context访问它。像这样：

context

基本上，当您使用

class PostSerializer(serializers.ModelSerializer):
    ...
    def get_is_login_user_favorite(self, validated_date):
        request = self.context['request'] # <-- Here
        ....
        return value # I need change this dynamically

时，请求会通过上下文自动发送到串行器。文档的Generic API Views中也对此进行了说明。