REST応答で距離フィールドを取得するには？

Question

私は、緯度と経度に基づいて近接検索結果にGeoDjango GISを使用しています。

class Address(gismodels.Model): 
    # partner = models.ForeignKey(Partner, related_name="partner_addresses", on_delete=models.CASCADE) 
    street = gismodels.CharField(max_length=255) 
    city = gismodels.CharField(max_length=255) 
    postcode = gismodels.CharField(max_length=255, null=True, blank=True, default='0000') 
    country = gismodels.CharField(max_length=255) 
    businesses = gismodels.OneToOneField(Business, related_name="business_address", on_delete=models.CASCADE, null=True) 
    latitude = gismodels.FloatField(null=True, blank=True) 
    longitude = gismodels.FloatField(null=True, blank=True) 
    location = gismodels.PointField(null=True, blank=True) 

    objects = gismodels.GeoManager() 

    def __unicode__(self): 
     return self.street 

    class Meta: 
     verbose_name = "Address" 
     verbose_name_plural = "Addresses" 

    def save(self, *args, **kwargs): 
     if self.latitude and self.longitude: 
      self.location = Point(self.longitude, self.latitude) 

     super(Address, self).save(*args, **kwargs) 

そして、そうシリアライザは次のとおりです：

モデルは、静かでシンプルですので

class AddressSerializer(HyperlinkedModelSerializer): 
    name_of_business = serializers.CharField(source="businesses.name_of_business") 
    business_id = serializers.IntegerField(source="businesses.pk") 
    opening_time = serializers.TimeField(source="businesses.business_details.opening_time") 

    class Meta: 
     model = Address 
     fields = ('pk', 'distance', 'street', 'city', 'postcode', 
        'name_of_business', "business_id", 
        'opening_time') 

、私は応答を取得しようとすると、curl http://127.0.0.1:5000/api/businesses/37.4418834/-122.14301949999998/を使用して言う、私はこのエラーは、関連する取得します距離フィールドへ：

Traceback (most recent call last): 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django/contrib/staticfiles/handlers.py", line 63, in __call__ 
    return self.application(environ, start_response) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/whitenoise/base.py", line 66, in __call__ 
    return self.application(environ, start_response) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django/core/handlers/wsgi.py", line 189, in __call__ 
    response = self.get_response(request) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django/core/handlers/base.py", line 218, in get_response 
    response = self.handle_uncaught_exception(request, resolver, sys.exc_info()) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django/core/handlers/base.py", line 261, in handle_uncaught_exception 
    return debug.technical_500_response(request, *exc_info) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django_extensions/management/technical_response.py", line 6, in null_technical_500_response 
    six.reraise(exc_type, exc_value, tb) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django/core/handlers/base.py", line 132, in get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view 
    return view_func(*args, **kwargs) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/django/views/generic/base.py", line 71, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/rest_framework/views.py", line 477, in dispatch 
    response = self.handle_exception(exc) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/rest_framework/views.py", line 437, in handle_exception 
    self.raise_uncaught_exception(exc) 
    File "/Users/dff/.virtualenvs/dff/lib/python2.7/site-packages/rest_framework/views.py", line 448, in raise_uncaught_exception 
    raise exc 
ImproperlyConfigured: Field name `distance` is not valid for model `Address`. 

ここは私のapiビューです：

class ProximityFilter(ListAPIView): 
    serializer_class = AddressSerializer 

    def get_queryset(self): 
     longitude = self.kwargs.get('longitude') 
     latitude = self.kwargs.get('latitude') 
     current_point = GEOSGeometry('POINT(%s %s)' % (longitude, latitude), srid=4326) 
     queryset = Address.objects.filter(city="SomeCity",location__distance_lte=(current_point, D(mi=700000000))).distance(
      current_point).order_by('distance') 
     return queryset 

これを解決してREST応答で距離を得る方法はありますか？ 手がかりはありますか？誰でも？ :)

おかげ

私はDjangoの1.8を使用しています。

Answer 1

ここでの問題は、distanceという名前の存在しないフィールドに基づいてクエリーセットをソートしようとしていることです。あなたはhttps://github.com/djangonauts/django-rest-framework-gis見てきました、問題は別に

from django.contrib.gis.db.models.functions import Distance 
Address.objects.filter(...).annotate(distance=Distance("location", current_point).order_by("distance")