DRF：通过 ManyToMany 类别和标签字段获取相关帖子

Question

我正在尝试通过获取当前 post 的 ID 并通过数据库过滤以查找类似的 posts 来获取所有相关的 posts类别或具有相似标签。

这是 post 的模型：

class Post(models.Model):
    ....
    author = models.ForeignKey(
        "users.User", on_delete=models.CASCADE, related_name='blog_posts')
    tags = TaggableManager()
    categories = models.ManyToManyField(
        'Category')
    ....
    status = models.IntegerField(choices=blog_STATUS, default=0)

    def __str__(self):
        return self.title

这是 views.py 文件：

class RelatedPostsListAPIView(generics.ListAPIView):
    serializer_class = PostsSerializer
    queryset = BlogPost.objects.filter(
        status=1)[:5]
    model = BlogPost

def get_context_data(self, **kwargs):
    context = super(RelatedPostsListAPIView,
                    self).get_context_data(**kwargs)
    pk = self.kwargs['pk']
    main_post = BlogPost.objects.get(pk=pk)

    related_posts = main_post.filter(
        Q(categories__in=main_post.categories.all()) |
        Q(tags__in=main_post.tags.all())).exclude(pk=pk)[:5]

    context['related_posts'] = related_posts
    return context

这是序列化程序

    class CategoriesSerializer(serializers.ModelSerializer):

    class Meta:
        model = Category
        fields = ['id', 'title', 'slug']


class PostsSerializer(TaggitSerializer, serializers.ModelSerializer):
    categories = CategoriesSerializer(many=True)
    author = UserSerializer()
    tags = TagListSerializerField()
    cover = serializers.SerializerMethodField('get_image_url')

    class Meta:
        model = BlogPost
        fields = [
            "id",
            "title",
            "slug",
            "author",
            "description",
            "content",
            "tags",
            "categories",
            "keywords",
            "cover",
            "created_on",
            "updated_on",
            "status",
        ]

    def get_image_url(self, obj):
        request = self.context.get("request")
        return request.build_absolute_uri(obj.cover.url)

url 模式：

urlpatterns = [
    path('all/', PostsListAPIView.as_view(), name="all_posts"),
    path('recent/', RecentPostsListAPIView.as_view(), name="recent_posts"),
    path('related/<int:pk>/', RelatedPostsListAPIView.as_view(), name="related_posts")
]

使用这段代码我得到一个 RelatedPostsListAPIView.get() got multiple values for argument 'pk' 错误，我不认为我实际上得到了带有 id 的对象，任何帮助将不胜感激。

Answer 1

您还必须在 get() 中捕获 request，因此更改：

class RelatedPostsListAPIView(generics.ListAPIView):
    def get(self, pk):
        # ...

至：

class RelatedPostsListAPIView(generics.ListAPIView):
    def get(self, request, pk):
        #         ^^^ Add this

DRF：通过 ManyToMany 类别和标签字段获取相关帖子

Drf: Getting related posts by ManyToMany category and a tags field

python

django

django-rest-framework