python - Django-rest-framework 多个 url 参数

Question

如何将“示例对象”映射到 url:website.com/api/<user>/<slug> .

我明白了
invalid literal for int() with base 10: 'username'错误。所以我知道我需要使用用户 ID 才能映射到对象，这是因为如果我使用 user_id(整数)(url:website.com/api/<user_id>/<slug>)而不仅仅是用户/用户名(字符串)。

在将对象从 user_id(整数)映射到另一个字段(如 user(字符串))时，有没有办法覆盖默认值？

另外我不明白为什么在 def get_object 中传递用户而不是 user_id|在 (Api View) 中没有解决这个问题。

网址

urlpatterns = [
    url(r'^api/(?P<user>\w+)/(?P<slug>[\w-]+)/$', ExampleDetailAPIView.as_view(), name='example'),
]

API View

class ExampleDetailAPIView(RetrieveAPIView):
    queryset = Example.objects.all()
    serializer_class = ExampleDetailSerializer

    def get_object(self):
        user = self.kwargs.get('user')
        slug = self.kwargs.get('slug')
        return Example.objects.get(user=user, slug=slug)

    def get_serilizer_context(self, *args, **kwargs):
        return {'request': self.request}

序列化器

class ExampleDetailSerializer(HyperlinkedModelSerializer):
    url = serializers.SerializerMethodField()

    class Meta:
        model = Example
        fields = [
            'url',
        ]

    def get_url(self, obj):
        request = self.context.get('request')
        return obj.get_api_url(request=request)

型号

class Example(models.Model):
    user                = models.ForeignKey(settings.AUTH_USER_MODEL, default=1)
    example_name         = models.CharField(max_length=100)
    slug                = models.SlugField(max_length=100, blank=True)

    class Meta:
        unique_together = ('user', 'slug')

    def get_api_url(self, request=None):
        return api_reverse('example-api:example', kwargs={'user': self.user.username, 'slug': self.slug}, request=request)

@receiver(pre_save, sender=Example)
def pre_save_example_slug_receiver(sender, instance, *args, **kwargs):
    slug = slugify(instance.example_name)
    instance.slug = slug

Answer 1

您可以在网址中使用用户名。为此，您必须首先手动找到用户，然后使用其 id 找到 Example 对象:

def get_object(self):
    username = self.kwargs.get('username')
    slug = self.kwargs.get('slug')

    # find the user
    user = User.objects.get(username=username)

    return Example.objects.get(user=user.id, slug=slug)