Improve error messages

dnssync_perm.py

@@ -131,11 +131,13 @@ class NameZoneValidator(CustomValidator):
 
         # This check is necessary because of the prefix-DNS view relation of dns_sync
         if not ipaddress_in_existing_prefix(ipaddress, request):
-            self.fail(f"IP address '{ipaddress}' is not in any existing prefix", field="address")
+            self.fail(f"Prefix for '{ipaddress}' not found in VRF '{ipaddress.vrf}'", field="address")
 
         if not prefix_has_dns_view(ipaddress, request):
-            self.fail(f"IP address '{ipaddress}' is in a prefix for which there is no DNS view defined. Ask your NetBox administrator", field="address")
+            self.fail(f"Prefix for '{ipaddress}' has no DNS view defined. Ask your NetBox administrator", field="address")
 
         if not name_has_valid_zone(dns_name, ipaddress, request):
-            self.fail(f"Name '{dns_name}' is in an non-existing zone name", field="dns_name")
+            words = dns_name.split(".")
+            supposed_zone = '.'.join(words[1:])
+            self.fail(f"Zone does not exist. Is '{supposed_zone}' correct?", field="dns_name")