如何将额外的上下文传递给Django Rest Framework序列化程序 [英] How to pass extra context to Django Rest Framework serializers

问题描述

这是我第一个使用Django rest框架的项目，而我正努力做到这一点。我知道在主流Django框架中，如果需要在基于类的视图中添加额外的上下文，我将执行以下操作：

It is my first project using Django rest framework and i'm struggling to get this right. I know that in mainstream Django framework, if i need to add extra contexts to a class-based view, i will do something like this:

class PostDetail(DetailView):
    model = Post

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        # Add in a QuerySet of all the books by a certain author John
        context['john_books'] = Book.objects.filter(author=john)
        return context

然后，我将能够访问模板中的上下文 john_books。现在，我需要通过将额外的上下文传递给我的PostViewSets来执行相同的操作。在详细信息视图上，我想访问该帖子作者在我的api端点中撰写的帖子列表（类似于同一作者的帖子）。我已经读过有关 get_serializer_context 的信息，但仍然不知道如何实现。这是我到目前为止所拥有的：

then, i will be able to access the context 'john_books' in my template. Now i need to do same by passing extra contexts to my PostViewSets. On the detail view, i want to access the list of post authored by that post author in my api endpoint (something like 'Posts from the same author'). I have read about get_serializer_context but still can't figure out how to implement it. This is what i have so far:

class PostViewSets(viewsets.ModelViewSet):
    queryset = Post.objects.all()
    serializer_class = PostSerializer

     def get_serializer_context(self):
        context = super(PostViewSets, self).get_serializer_context()
        author = self.get_object.author
        author_posts = self.get_queryset().filter(author=author)
        context.update({'author_posts': author_posts})
        return context

我得到这个错误：

AttributeError at / posts /'function'对象没有属性'author'

AttributeError at /posts/ 'function' object has no attribute 'author'

我的帖子模型：

class Post(models.Model):
    title = models.CharField(max_length=100, unique=True)
    body = models.TextField()
    is_featured = models.BooleanField(default=True)
    viewcount = models.IntegerField(default=0)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    created = models.DateTimeField(auto_now_add=True)

和我的PostSerializer类：

and my PostSerializer class:

class PostSerializer(serializers.ModelSerializer):
    author = UserSerializer()

    class Meta:
        model = Post
        fields = ['id', 'title', 'body', 'author', 'viewcount', 'is_featured', 'created']

推荐答案

您必须使用 get_object 作为函数，而不是作为属性：

You have to use get_object as func, not as property:

class PostViewSets(viewsets.ModelViewSet):
    queryset = Post.objects.all()
    serializer_class = PostSerializer

     def get_serializer_context(self):
        context = super(PostViewSets, self).get_serializer_context()
        author = self.get_object().author
        author_posts = self.get_queryset().filter(author=author)
        context.update({'author_posts': author_posts})
        return context

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