Question

distance方法在GeoDjango（QuerySet）中不起作用

我的模特：

class City(models.Model):

    name_english = models.CharField(max_length=500, null=True, blank=True)
    site = models.ForeignKey(Site, on_delete=models.CASCADE, null=True, blank=True, verbose_name="city", db_index=True, related_name="city_relate")
    name_city_avito = models.CharField(max_length=500, null=True, blank=True)
    country = models.ForeignKey(Country, on_delete=models.CASCADE, null=True, blank=True, verbose_name="Country", db_index=True, related_name="Country_relate")
    region = models.ForeignKey(Region, on_delete=models.CASCADE, null=True, blank=True, verbose_name="Region", db_index=True, related_name="Region_relate")
    point = models.PointField(blank=True, null=True)

view.py

class Landing_head(View):

    def get(self, request):
        b = Site.objects.get_current()
        current_location = City.objects.get(site__id=b.id).point

        cities = City.objects.filter(point__distance_lte=(current_location, D(km=200))).distance(current_location).order_by('point_distance')[:1][0]

        for z in cities:
           print(z)

输出错误'QuerySet'对象没有属性'distance'

尽管它在此版本中有效，但无需按距离排序

class Landing_head(View):

    def get(self, request):
        b = Site.objects.get_current()
        current_location = City.objects.get(site__id=b.id).point

        cities = City.objects.filter(point__distance_lte=(current_location, D(km=200)))
        for z in cities:
            print(z)

Answer 1

在Django版本> = 1.9中，.distance不存在。

您需要将距离测量值注释到查询集，然后通过注释字段进行排序：

cities = City.objects.filter(
    point__distance_lte=(current_location, D(km=200))
).annotate(
    distance=Distance('point', current_location)
).order_by('distance')

我无法在GeoDjango（PostGis）中按城市距离排序

1 个答案: