python - Django 序列化器将模型字段显示为字典

Question

抱歉，刚接触 Django。我一直在搜索文档，但无法找到这个问题的答案。

我有一个模型“Foo”，它有一个字段“bar”，它是我在 TextField 中以 JSON 形式存储的字典。我希望 GET 请求将此字段显示为字典，但当我发出请求时，字典会显示为 JSON 格式的单个字符串。

总结我的代码:

型号:

class Foo(models.Model):
    bar = models.TextField(blank=True, default="{}")
    def getBar(self):
        return json.loads(bar)

序列化器:

class FooSerializer(serializers.ModelSerializer):
    class Meta:
        model = Foo
        fields = ("bar")
        read_only_fields = ("bar")
    def create(self, data):
        return Foo.objects.create(**data)

浏览次数:

class FooList(generics.ListAPIView):
    queryset = []
    for foo in Foo.objects.all():
        foo.bar = json.loads(foo.bar)
        # Printing type of foo.bar here gives "type <dict>"
        queryset.append(foo)
    serializer_class = FooSerializer

谢谢!

Answer 1

您可以添加SerializerMethodField到您的 ModelSerializer 类，如下所示:

class FooSerializer(serializers.ModelSerializer):
    class Meta:
        model = Foo
        fields = ('bar',)
        read_only_fields = ('bar',) # Not required, because 
                                    # SerializerMethodField is read-only already

    bar = serializers.SerializerMethodField('get_bar_dict')

    def get_bar_dict(self, obj):
        return json.loads(obj.bar)  # This gets the dict and returns it
                                    # to the SerializerMethodField above

    # Below is the rest of your code that I didn't touch
    def create(self, data):
        return Foo.objects.create(**data)