将多余的参数与request.POST一起传递给Django Model Forms

Question

I have a Rating models with some fields in which ip and url and required fields. I get some of these fields in request.POST but I have to pass ip and url to the modelform from my view. My Model:

class Rating(models.Model):

    rating = core_fields.SmallIntegerRangeField(min_value=1, max_value=5)
    url = models.URLField(max_length=2048)
    tracker = models.ForeignKey("core.Tracker", db_index=True)
    ip = models.GenericIPAddressField(db_index=True)
    user_agent = models.CharField(max_length=100)
    object_id = models.PositiveIntegerField(db_index=True)
   _content_type = models.ForeignKey(ContentType, db_index=True)
   special_object = GenericForeignKey('_content_type', 'object_id')

class Meta:
    unique_together = ['_content_type', 'tracker', 'object_id']
    verbose_name = ('rating')

In my views.py :

form = RatingModelForm(request.POST, ip=ip, url=url)

if form.is_valid():
    instance = form.save(commit=False)
    instance.save()

And my in forms.py:

class RatingModelForm(forms.ModelForm):

    class Meta:
        model = Rating
        exclude = ('special_object',)

    def __init__(self, *args, **kwargs):
        ip = kwargs.pop('ip', None)
        url = kwargs.pop('url', None)

        super(RatingModelForm, self).__init__(*args, **kwargs)
        self.fields['ip'].initial = ip
        self.fields['url'].initial = url

I have tried setting initial values but the form.is_valid() give False and and states that ip and url are required. How do proceed with this ?

Answer 1

The first argument of a ModelForm is data. Ie the expected data for the form. As you mentioned that request.POST is an immutable querydict. Make a new dictionary by making a copy out of it , modify that and then pass it into the form.

If you use dict() on a django QueryDict it will look odd. So you have to make a copy of the query dict to make it work properly.

data = request.POST.copy()
data['ip'] = ip
data['url'] = url
form = RatingModelForm(data)