从postgresql django获取Topojson

# models.py
from django.contrib.gis.db import models

class GeoData(models.Model):
    name = models.CharField(max_length=50)
    geometry = models.GeometryField()

# views.py
from django.http import JsonResponse
from django.contrib.gis.geos import GEOSGeometry
from django.contrib.gis.db.models.functions import Transform
from django.views.decorators.http import require_http_methods
from .models import GeoData

@require_http_methods(['GET'])
def get_topojson(request):
    queryset = GeoData.objects.annotate(transformed_geometry=Transform('geometry', 4326))
    topojson_data = {
        'type': 'Topology',
        'objects': {
            'geoData': {
                'type': 'GeometryCollection',
                'geometries': [
                    {
                        'type': 'Polygon',
                        'properties': {
                            'name': obj.name
                        },
                        'arcs': obj.transformed_geometry.coords
                    }
                    for obj in queryset
                ]
            }
        }
    }
    return JsonResponse(topojson_data)