validate prefix

ipv6ula/forms.py

@@ -10,3 +10,5 @@ class ULAForm(forms.ModelForm):
     def clean_prefix(self):
         prefix = self.cleaned_data['prefix']
         validate_ula_prefix(prefix)
+
+        return prefix

ipv6ula/models.py

@@ -13,14 +13,24 @@ def validate_ula_prefix(prefix):
     net = ipaddress.IPv6Network(net_str, strict=False)
 
     if not net.subnet_of(ula_net):
-        print("raising error here")
-        v = ValidationError(
+        raise ValidationError(
             _(f"Prefix {prefix} is not within ULA range ({ula_net})"),
             code='invalid',
-            params = {'prefix': prefix }
+            params = {'prefix': net }
         )
-        print(v)
-        raise v
+
+
+    try:
+        ULA.objects.get(prefix=str(net[0]))
+    except ULA.DoesNotExist:
+        pass
+    else:
+        raise ValidationError(
+            _(f"Prefix {net} is already registered"),
+            code='invalid',
+            params = {'prefix': net }
+        )
+
 
 
 class User(AbstractUser):

ipv6ula/views.py

@@ -21,9 +21,10 @@ class IndexView(ListView):
 class SubmitView(LoginRequiredMixin, CreateView):
     model = ULA
 
+    form_class = ULAForm
     login_url = '/login/'
     success_url = '/'
-    form_class = ULAForm
+
 
     def form_valid(self, form):
         form.instance.owner = self.request.user