python之Django 休息框架 : Could not resolve URL for hyperlinked relationship using view name "post-detail"

我找到了很多类似问题的答案，但没有一个对我有帮助。 我是后端和 Django 的新手，我已经花了几天时间试图找出我做错了什么，但没有成功。 我将不胜感激任何帮助! 所以，当我调用 http://127.0.0.1:8000/users/ {用户名}/ 我得到:

ImproperlyConfigured: Could not resolve URL for hyperlinked relationship using view name "post-detail". You may have failed to include the related model in your API, or incorrectly configured the lookup_field attribute on this field.

如果我在任何其他字段上更改 HyperlinkedRelatedField 它工作正常...

urls.py

 app_name = 'api' 
urlpatterns = [ 
        url(r'^posts/(?P<post_id>\d+)/$', PostDetails.as_view(), 
            name='post-detail'), 
        url(r'^users/(?P<username>[\w\-]+)/$', UserPosts.as_view()), 
    ] 

views.py

class PostDetails(APIView): 
    """ 
        - GET a post 
 
    """ 
 
    def get(self, request, post_id): 
 
        post = Post.objects.get(id=post_id) 
        post_serializer = PostSerializer(post) 
 
        return Response(post_serializer.data) 
 
class UserPosts(APIView): 
    """ 
        GET all user posts 
    """ 
 
    def get(self, request, username): 
        user = User.objects.get(username=username) 
        serializer = UserSerializer(user, context={'request': request}) 
        return Response(serializer.data) 

序列化器.py

  class UserSerializer(serializers.ModelSerializer): 
    posts = serializers.HyperlinkedRelatedField(many=True, 
                                                read_only=True, 
                                                view_name='post-detail', 
                                                lookup_field='id') 
    #  Mandatory for UUID serialization 
    user_id = serializers.UUIDField() 
 
    class Meta: 
        model = User 
        exclude = ('id', 'password') 
        read_only_fields = ('created', 'username', 'posts',) 
 
 
class PostSerializer(serializers.ModelSerializer): 
 
    author = UserSerializer() 
 
    class Meta: 
        model = Post 
        fields = '__all__' 

模型.py

     class User(models.Model): 
   username = models.CharField(max_length=30, unique=True) 
   password = models.CharField(max_length=50) 
   email = models.EmailField(unique=True) 
   first_name = models.CharField(max_length=30) 
   last_name = models.CharField(max_length=30) 
   phone = models.CharField(max_length=20, blank=False, unique=True) 
   user_id = models.UUIDField(editable=False, 
                           unique=True, 
                           null=False, 
                           db_index=True,) 
  created = models.DateTimeField() 
  id = models.BigAutoField(primary_key=True) 
 
  class Meta: 
      ordering = ('created',) 
 
  def __unicode__(self): 
      return "Email: %s " % self.email 
 
 
class Post(models.Model): 
   created = models.DateTimeField() 
   is_active = models.BooleanField(default=False) 
   title = models.CharField(max_length=200, blank=False) 
   body_text = models.CharField(max_length=1000, blank=False) 
   address = models.CharField(max_length=100) 
   author = models.ForeignKey(User, on_delete=models.PROTECT, 
                           related_name='posts') 
   price = models.DecimalField(max_digits=10, decimal_places=0) 
   id = models.BigAutoField(primary_key=True) 
 
  class Meta: 
      ordering = ('created',) 
 
  def __unicode__(self): 
      return "Title : %s , Author:  %s  " % (self.title, self.author) 

请您参考如下方法:

您的 lookup_field 与您的 url 不匹配，即 post_id

url(r'^posts/(?P<post_id>\d+)/$', PostDetails.as_view(), 
        name='post-detail'), 

来自文档:

• lookup_field - 目标上应该用于查找的字段。应对应于引用 View 上的 URL 关键字参数。默认为“pk”。
• lookup_url_kwarg - 与查找字段对应的 URL conf 中定义的关键字参数的名称。默认使用与 lookup_field 相同的值。

所以你应该没问题:

posts = serializers.HyperlinkedRelatedField(many=True, 
                                            read_only=True, 
                                            view_name='post-detail', 
                                            lookup_url_kwarg='post_id')