django - 使用 Django 序列化程序的 PUT 请求

Question

我有一种架构，当用户注册时，他/她的设置会被初始化。所以我们需要 GET 和 PUT 来分别获取或更新设置 API 上的设置。

我正在使用 django rest 框架的模型序列化器来存储和获取设置。它在给出响应方面效果很好，但不能将其保存到模型中。

serializers.py

class UserSettingsSerializer(serializers.ModelSerializer):

    class Meta:
        model = UserSettings
        fields = ('group_notifications', 'updates', 'goal_remind_me', 
                  'goal_days', 'goal_time_interval', 'user')

models.py

class UserSettings(models.Model):

class Meta:
    db_table = 'user_settings'

user = models.ForeignKey('User')
group_notifications = models.BooleanField(default=True)
updates = models.BooleanField(default=False)
goal_remind_me = models.BooleanField(default=False)
goal_days = ListField()
goal_time_interval = models.IntegerField(null=True)

views.py

def settings(request, pk):
    if request.method == 'PUT':
        request.data['user'] = user.id

        serializer = UserSettingsSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            serializer_dict = serializer.data
            serializer_dict["message"] = "Settings updated successfully."
            return Response(serializer_dict, status=status.HTTP_200_OK)
        else:
            return Response(serializer.errors,
                            status=status.HTTP_400_BAD_REQUEST)

我得到了预期的响应，但它没有在 user_settings 中存储数据表，我正在使用 PostgreSql。

Answer 1

为了让 ModelSerializer 执行更新，您需要将要更新的实例传递给构造函数。

def settings(request, pk):
    # query for the UserSettings object
    instance = get_object_or_404(UserSettings.objects.all(), pk=pk)

    if request.method == 'PUT':
        request.data['user'] = user.id

        # pass in the instance we want to update
        serializer = UserSettingsSerializer(instance, data=request.data)

        # validate and update
        if serializer.is_valid():
            serializer.save()
            serializer_dict = serializer.data
            serializer_dict["message"] = "Settings updated successfully."
            return Response(serializer_dict, status=status.HTTP_200_OK)
        else:
            return Response(serializer.errors,
                            status=status.HTTP_400_BAD_REQUEST)