How to pass extra context to Django Rest Framework serializers

Question

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 cl

Answer 1

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

Answer 2

1. The Error Message

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

explicitly explains what and where is the problem:

author = self.get_object.author

I guess you tried to do something like this

author = self.get_object().author

2. A DRF ViewSet

responses with data serialized by corresponding Serializer. So you don't need to change the ViewSet, but update the Serializer with something like:

class PostListSerializer(serializers.ModelSerializer):
    ... some fields ...

    class Meta:
        model = Post
        fields = [ ... some fields ... ]


class PostDetailsSerializer(serializers.ModelSerializer):
    ... some fields ...

    author_posts = PostListSerializer(source="author.post_set", many=True, read_only=True)

    class Meta:
        model = Post
        fields = [ ... some fields ... , 'author_posts']

or with SerializerMethodField

    class PostDetailsSerializer(serializers.ModelSerializer):
    ... some fields ...

    author_posts = serializers.SerializerMethodField()

    def get_author_posts(self, obj):
        return PostListSerializer(instance=obj.post_set.all(), many=True).data

    class Meta:
        model = Post
        fields = [ ... some fields ... , 'author_posts']

I didn't try this exact code, but this is the main idea.