Python 如何使用Django和rest_框架通过url中的外键检索对象

假设我使用两个简单的模型：

class Location(models.Model):
    location_name = models.CharField(max_length=100)
    country = models.ForeignKey("Country")

class Country(models.Model):
    country_name = models.CharField(max_length=100)

要通过主键检索对象，我定义了如下（）的视图和URL：

致以最良好的祝愿，

---

迈克尔

好的，现在我自己运行了。事情是这样的：

class LocationByCountryListAPIView(generics.ListAPIView):
    def get(self, request, country_pk):
        # get the country by its primary key from the url
        country = Country.objects.get(pk=country_pk)

        locations = Location.objects.filter(country=country)
        location_serializer = LocationSerializer(locations, many=True)

        return Response({
            'locations': location_serializer.data
        })

我使用的url定义如上所述：

url(r'^location-by-country/(?P<country_pk>[0-9]+)/$', views.LocationByCountryListAPIView.as_view(), name='location-by-country-detail')

url（r'^location by country/（？P[0-9]+）/$），views.LocationByCountryListAPIView.as_view（），name='location-by-country-detail'）

无论如何，我不确定这个解决方案是否是最好的方法。如果您能给我一些建议来改进我的解决方案，我将不胜感激

致以最良好的祝愿， 迈克尔

class LocationByCountryIdAPIView(generics.GenericAPIView):        
    def get(self, request, country_pk):
        locations = Location.objects.all() # .filter(???)
        location_list = list()
        for location in locations:
            # now I would do something similar to this
            # or use a filter on locations instead of creating location_list 
            # and appending locations to it
            if location.country.pk == country_pk:
                location_list.append(location)        

        location_serializer = LocationSerializer(location_list, many=True)
        # or location_serializer = LocationSerializer(locations, many=True) when using filter

        return Response({
            'locations': location_serializer.data
        })

class LocationByCountryListAPIView(generics.ListAPIView):
    def get(self, request, country_pk):
        # get the country by its primary key from the url
        country = Country.objects.get(pk=country_pk)

        locations = Location.objects.filter(country=country)
        location_serializer = LocationSerializer(locations, many=True)

        return Response({
            'locations': location_serializer.data
        })

url(r'^location-by-country/(?P<country_pk>[0-9]+)/$', views.LocationByCountryListAPIView.as_view(), name='location-by-country-detail')