Change clean method (specific to a field)

coin/resources/models.py

@@ -15,7 +15,7 @@ class IPPool(models.Model):
     inet = CidrAddressField()
     objects = NetManager()
 
-    def clean(self):
+    def clean_default_subnetsize(self):
         if self.inet.version == 4:
             if not self.inet.prefixlen <= self.default_subnetsize <= 32:
                 raise ValidationError('Invalid default subnet size')