在Model Serializer中获取当前用户

问题描述

可以在模型序列化程序中获取当前用户吗？我想这样做，而不用分散泛型，因为这是一个简单的任务，必须完成。

Is it possible to get the current user in a model serializer? I'd like to do so without having to branch away from generics, as it's an otherwise simple task that must be done.

我的模型：

class Activity(models.Model):
    number = models.PositiveIntegerField(
        blank=True, null=True, help_text="Activity number. For record keeping only.")
    instructions = models.TextField()
    difficulty = models.ForeignKey(Difficulty)
    categories = models.ManyToManyField(Category)
    boosters = models.ManyToManyField(Booster)

    class Meta():
        verbose_name_plural = "Activities"

我的序列化程序：

class ActivitySerializer(serializers.ModelSerializer):

    class Meta:
        model = Activity

我的观点：

class ActivityDetail(generics.RetrieveUpdateDestroyAPIView):

    queryset = Activity.objects.all()
    serializer_class = ActivityDetailSerializer

如何获取返回的模型，附加字段用户，使我的回复如下所示：

How can I get the model returned, with an additional field user such that my response looks like this:

{
    "id": 1,
    "difficulty": 1,
    "categories": [
        1
    ],
    "boosters": [
        1
    ],
    "current_user": 1 //Current authenticated user here
}

推荐答案

我通过Djangorestframework源代码找到答案。

I found the answer through the Djangorestframework source code.

class ActivitySerializer(serializers.ModelSerializer):

    # Create a custom method field
    current_user = serializers.SerializerMethodField('_user')

    # Use this method for the custom field
    def _user(self, obj):
        user = self.context['request'].user
        return user

    class Meta:
        model = Activity
        # Add our custom method to the fields of the serializer
        fields = ('id','current_user')

关键是在 ModelSerializer 中定义的方法可以访问他们自己的上下文，这个上下文总是包含请求（当一个被认证的时候它包含一个用户） ）。由于我的权限仅适用于经过身份验证的用户，所以应该总是有些东西。

The key is the fact that methods defined inside a ModelSerializer have access to their own context, which always includes the request (which contains a user when one is authenticated). Since my permissions are for only authenticated users, there should always be something here.

这也可以在其他内置的djangorestframework序列化器中完成。

This can also be done in other built-in djangorestframework serializers.

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