DNS endpoint SQL optimization

api/serializers.py

@@ -701,10 +701,11 @@ class CNAMERecordSerializer(serializers.ModelSerializer):
     """
     alias = serializers.CharField(source='cname.name', read_only=True)
     hostname = serializers.CharField(source='name', read_only=True)
+    extension = serializers.CharField(source='extension.name', read_only=True)
 
     class Meta:
         model = machines.Domain
-        fields = ('alias', 'hostname')
+        fields = ('alias', 'hostname', 'extension')
 
 
 class DNSZonesSerializer(serializers.ModelSerializer):

api/views.py

@@ -491,7 +491,14 @@ class DNSZonesView(generics.ListAPIView):
     """Exposes the detailed information about each extension (hostnames, 
     IPs, DNS records, etc.) in order to build the DNS zone files.
     """
-    queryset = machines.Extension.objects.all()
+    queryset = (machines.Extension.objects
+                .prefetch_related('soa')
+                .prefetch_related('ns_set').prefetch_related('ns_set__ns')
+                .prefetch_related('origin')
+                .prefetch_related('mx_set').prefetch_related('mx_set__name')
+                .prefetch_related('txt_set')
+                .prefetch_related('srv_set').prefetch_related('srv_set__target')
+                .all())
     serializer_class = serializers.DNSZonesSerializer
 
 

machines/models.py

@@ -563,13 +563,22 @@ class Extension(RevMixin, AclMixin, models.Model):
         return entry
 
     def get_associated_a_records(self):
-        return Interface.objects.filter(type__ip_type__extension=self).filter(ipv4__isnull=False)
+        return (Interface.objects
+                .filter(type__ip_type__extension=self)
+                .filter(ipv4__isnull=False)
+                .prefetch_related('domain')
+                .prefetch_related('ipv4'))
 
     def get_associated_aaaa_records(self):
-        return Interface.objects.filter(type__ip_type__extension=self)
+        return (Interface.objects
+                .filter(type__ip_type__extension=self)
+                .prefetch_related('domain'))
 
     def get_associated_cname_records(self):
-        return Domain.objects.filter(extension=self).filter(cname__isnull=False)
+        return (Domain.objects
+                .filter(extension=self)
+                .filter(cname__isnull=False)
+                .prefetch_related('cname'))
 
     @staticmethod
     def can_use_all(user_request, *_args, **_kwargs):