Я пытаюсь сериализовать в geo json модель с внешним ключом, имеющим поле геометрии. Я использую django -rest-framework-gis. Я использую django 2.2
Я застрял на этом, и ни один из других связанных ответов на переполнение стека не работает для меня. Например, я пробовал версии этого:
Проблема в том, что я получаю эту ошибку: Ожидается, что Response
, HttpResponse
или HttpStreamingResponse
будет возвращено из просмотр, но получил <class 'statements.models.Response'>
Модели:
from django.contrib.gis.db import models
from django.contrib.gis.geos import Point
class Hexgrid_10km2(models.Model):
lng = models.FloatField()
lat = models.FloatField()
polygon = models.MultiPolygonField(srid=4326)
centroid = models.PointField(default=Point(0,0), srid=4326)
def __str__(self):
return f'lng: { self.lng } lat: {self.lat }'
class Response(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
statement = models.ForeignKey(Statement, on_delete=models.CASCADE)
hexgrid_10km2 = models.ForeignKey(Hexgrid_10km2, on_delete=models.CASCADE, null=True, blank=True)
@property
def polygon(self):
return self.hexgrid_10km2.polygon
Просмотров
class ResponseHeatmapAPIView(APIView): #ReadOnly
def get(self, request, pk):
final = Response.objects.all()
serializer = ResponseHeatmapSerializer(final, many=True)
return Response(serializer.data)
Сериализаторы
class ResponseHeatmapSerializer(GeoFeatureModelSerializer):
""" A class to serialize hex polygons as GeoJSON compatible data """
hexgrid_10km2 = GeometrySerializerMethodField()
def get_hexgrid_10km2(self, obj):
return obj.hexgrid_10km2.polygon
class Meta:
model = Response
geo_field = 'hexgrid_10km2'
id_field = False
fields = ('id',)
Traceback
OrderedDict([('type', 'FeatureCollection'), ('features', [OrderedDict([('id', 2), ('type', 'Feature'), ('geometry', GeoJsonDict([('type', 'MultiPolygon'), ('coordinates', [[[[0.52353663711945, 50.8631481850499], [0.538799411254891, 50.86870974483], [0.554062185390241, 50.8631481850499], [0.554062185390241, 50.852023074998], [0.548895002474644, 50.85013962], [0.540831980000019, 50.85013962], [0.53199000192362, 50.8489417564374], [0.52353663711945, 50.852023074998], [0.52353663711945, 50.8631481850499]]]])])), ('properties', OrderedDict([('response_date', '2020-04-15T21:04:04.599597Z'), ('agree', 1), ('hasLocation', False), ('location', GeoJsonDict([('type', 'Point'), ('coordinates', [0.550660257722784, 50.851541821108924])])), ('latitude', 50.851541821108924), ('longitude', 0.5506602577227836), ('locationAccuracy', 0.0), ('user', 1), ('statement', 1)]))])])])
Internal Server Error: /statements/api/heatmap/1
Traceback (most recent call last):
File "C:\Users\anton\OneDrive\Documents\django\karate-project-2.2\venv\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
response = get_response(request)
File "C:\Users\anton\OneDrive\Documents\django\karate-project-2.2\venv\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "C:\Users\anton\OneDrive\Documents\django\karate-project-2.2\venv\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\anton\OneDrive\Documents\django\karate-project-2.2\venv\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "C:\Users\anton\OneDrive\Documents\django\karate-project-2.2\venv\lib\site-packages\django\views\generic\base.py", line 71, in view
return self.dispatch(request, *args, **kwargs)
File "C:\Users\anton\OneDrive\Documents\django\karate-project-2.2\venv\lib\site-packages\rest_framework\views.py", line 507, in dispatch
self.response = self.finalize_response(request, response, *args, **kwargs)
File "C:\Users\anton\OneDrive\Documents\django\karate-project-2.2\venv\lib\site-packages\rest_framework\views.py", line 419, in finalize_response
assert isinstance(response, HttpResponseBase), (
AssertionError: Expected a `Response`, `HttpResponse` or `HttpStreamingResponse` to be returned from the view, but received a `<class 'statements.models.Response'>`
[15/Apr/2020 21:55:04] "GET /statements/api/heatmap/1 HTTP/1.1" 500 89414