Question

I’ve read every “InterityError” + “may no be NULL” post and still can’t track down what’s causing this error.

I’ve got a two-part signup form. First part is just selecting a product. That passes a product ID to the next page as part of the URL, where they input personal info. I can get the form to work fine until I start removing fields — i’m using model forms — because some fields don’t need to be displayed.

Here’s my model, and the modelForm:

class SimpleSubscriber(models.Model):
    name = models.CharField(max_length=255)
    address = models.CharField(max_length=200)
    city = models.CharField(max_length=100)
    state = models.CharField(max_length=2)
    zipcode = models.CharField(max_length=9)
    phone = models.CharField(max_length=10)
    email = models.EmailField()
    date_created = models.DateTimeField(null=True)
    sub_type = models.ForeignKey(Product)
    def __unicode__(self):
        return self.name


class SubscriberForm(ModelForm):
    class Meta:
        model = SimpleSubscriber
        fields = ('name', 'address', 'city', 'state', 'zipcode', 'phone', 'email', 'sub_type',)#'date_created', 

And here’s my views:

def select_product(request):
    title = "get yourself an e-edition. wurd."
    pform = Product.objects.order_by('product_active')  
    if request.method == 'POST': # If the form has been submitted...
        pform = ProductForm(request.POST) # A form bound to the POST data
        if pform.is_valid(): # All validation rules pass 
        # ...
            return HttpResponseRedirect('signup/%i' % pform.id) # Redirect after POST
    else:
        form = ProductForm() # An unbound form
    return render_to_response('signup/index.html', {'title': title, 'pform': pform}, context_instance=RequestContext(request))


def subscriber_signup(request, product_id):
    productchoice = Product.objects.get(id=product_id)
    now = datetime.datetime.now()
    title = "We need some information."  
    if request.method == 'POST': # If the form has been submitted...
        sform = SubscriberForm(request.POST) # A form bound to the POST data
        if sform.is_valid(): # All validation rules pass
            sform.date_created = now
            sform.sub_type = productchoice
            sform.save()
            return HttpResponseRedirect('thankyou/') # Redirect after POST
    else:
        sform = SubscriberForm() # An unbound form
    return render_to_response('signup/detail.html', {'title': title, 'sform': sform, 'productchoice': productchoice, 'now': now.date(),}, context_instance=RequestContext(request))

I think it has something to do with the modelForm, but I’m pretty new, so I really have no idea. If I add all the fields to SubscriberForm, then they get filled out and everything works fine. But I don’t want users to have to say when they filled out the form, so i put sform.date_created = now and I want the product_id to be filled in automatically by what choice they picked on the previous page. but if I exclude these fields from the form it throws the IntegrityError, which isn’t very helpful in explaining what to change.

Any hints on where I’m messing up?

Thanks,

Answer 1

Two things:

1) You may benefit from using exlude in your form definition:

class SubscriberForm(ModelForm):
    class Meta:
        model = SimpleSubscriber
        exclude = ('date_created', ) 

2) To your question, heres how to fix it:

if sform.is_valid(): # All validation rules pass

    suscriber = sform.save(commit=False)
    suscriber.date_created = now
    suscriber.sub_type = productchoice
    suscriber.save()