Update SubscriptionForm to allow creating user on the fly

subscription/views.py

@@ -1,7 +1,9 @@
 from django.shortcuts import render
 from django.views.generic.edit import UpdateView, CreateView
 from django.views.generic.base import View
-from django.core.exceptions import PermissionDenied
+from django.utils.translation import ugettext_lazy as _
+from django.core.exceptions import PermissionDenied, ValidationError
+from django.db import IntegrityError
 from django import forms
 from django.forms import Select
 from django.conf import settings
@@ -19,6 +21,41 @@ class SubscriptionForm(forms.ModelForm):
         model = Subscription
         fields = ['member', 'subscription_type', 'payment_method']
 
+    def __init__(self, *args, **kwargs):
+        super(SubscriptionForm, self).__init__(*args, **kwargs)
+        # Add fields to allow basic user creation
+        self.fields['last_name'] = forms.CharField(max_length=User._meta.get_field('last_name').max_length)
+        self.fields['first_name'] = forms.CharField(max_length=User._meta.get_field('first_name').max_length)
+        self.fields['email'] = forms.EmailField()
+        self.fields.move_to_end('subscription_type')
+        self.fields.move_to_end('payment_method')
+
+    def clean(self):
+        cleaned_data = super(SubscriptionForm, self).clean()
+        if (cleaned_data.get("member") is None
+                and "last_name" not in self.errors.as_data()
+                and "first_name" not in self.errors.as_data()
+                and "email" not in self.errors.as_data()):
+            self.errors.pop("member", None)
+            if Subscriber.objects.filter(email=cleaned_data.get("email")).first() is not None:
+                self.add_error("email", ValidationError(_("A user with that email address already exists")))
+            else:
+                u = Subscriber(last_name = self.cleaned_data.get("last_name"),
+                        first_name = self.cleaned_data.get("first_name"),
+                        email = self.cleaned_data.get("email"))
+                u.generate_username()
+                u.save()
+                cleaned_data["member"] = u
+        elif cleaned_data.get("member") is not None:
+            self.errors.pop("last_name", None)
+            self.errors.pop("first_name", None)
+            self.errors.pop("email", None)
+        if cleaned_data.get("member") is None:
+            # This should be handled here, but it is done in the Subscription model's clean method
+            # TODO investigate why!
+            raise ValidationError(_("You must either choose an existing user or create a new one properly"))
+        return cleaned_data
+
 class NewSubscription(CanEditMixin, CreateView): # TODO: this must be able to create a new user if needed
     template_name = 'subscription/subscription.jinja'
     form_class = SubscriptionForm
@@ -35,3 +72,4 @@ class NewSubscription(CanEditMixin, CreateView): # TODO: this must be able to cr
                 start=form.instance.subscription_start
                 )
         return super(NewSubscription, self).form_valid(form)
+