update for location extent

rog/views.py

@@ -12,6 +12,7 @@ from rest_framework.parsers import JSONParser, MultiPartParser
 from .serializers import LocationSerializer
 from django.http import JsonResponse
 from rest_framework.permissions import IsAuthenticated 
+from django.contrib.gis.db.models import Extent, Union
 
 from .serializers import TestSerialiser
 from .models import TestModel
@@ -204,6 +205,12 @@ def ExtentForMainPerf(request):
     # iata = serializers.serialize("json",ext)
     return JsonResponse(ext, safe=False)
 
+
+def ExtentForLocations(request):
+    locs = Location.objects.aggregate(Extent('geom'), Union('geom'))
+    return JsonResponse(locs['geom__extent'], safe=False)
+
+
 def ExtentForSubPerf(request):
     sub_perf_id = request.GET.get('sub_perf')
     sub_perf = JpnSubPerf.objects.get(id=sub_perf_id)