Ch22: Create Profile in UserCreationForm.

user/forms.py

@@ -4,7 +4,10 @@
 from django.contrib.auth import get_user_model
 from django.contrib.auth.forms import \
     UserCreationForm as BaseUserCreationForm
+from django.core.exceptions import ValidationError
+from django.utils.text import slugify
 
+from .models import Profile
 from .utils import ActivationMailFormMixin
 
 logger = logging.getLogger(__name__)
@@ -46,6 +49,23 @@ class Meta(BaseUserCreationForm.Meta):
         model = get_user_model()
         fields = ('username', 'email')
 
+    def clean_username(self):
+        username = self.cleaned_data['username']
+        disallowed = (
+            'activate',
+            'create',
+            'disable',
+            'login',
+            'logout',
+            'password',
+            'profile',
+        )
+        if username in disallowed:
+            raise ValidationError(
+                "A user with that username"
+                " already exists.")
+        return username
+
     def save(self, **kwargs):
         user = super().save(commit=False)
         if not user.pk:
@@ -55,6 +75,12 @@ def save(self, **kwargs):
             send_mail = False
         user.save()
         self.save_m2m()
+        Profile.objects.update_or_create(
+            user=user,
+            defaults={
+                'slug': slugify(
+                    user.get_username()),
+            })
         if send_mail:
             self.send_mail(user=user, **kwargs)
         return user