Form cleaned_data

I have an issue with save data from a form.

The actual form has one required and two optional fields.
The model has three additional fields that I want to assign based on
the context, two of those are ForeignKey related.

The post method in the view:
def post(self, request, *args, **kwargs):
form = self.form_class(request.POST)

if form.is_valid():
# <process form cleaned data>
paper = get_object_or_404(Paper,pk=kwargs['pk'])
reviewer =
Reviewer.objects.filter(user=self.request.user).filter(prj_name=paper.project)
form.cleaned_data['reviewer'] = reviewer[0]
form.cleaned_data['paper'] = paper
form.cleaned_data['stage'] = paper.current_stage
print(form.cleaned_data)
form.save()
return HttpResponseRedirect('#')
return render(request, self.template_name, {'form': form})

The form:
class ReviewTitleCreateForm(ModelForm):
class Meta:
model = Review
fields = ['include','exclusion_choice','exclusion_text',]


The model:
class Review(models.Model):
"""
A review at a specific stage of one paper.
"""
INCLUDE_CHOICES = [(True,'Include'),(False,'Exclude')]
STAGES = [('Selection by Title','Selection by Title'),('Selection
by Abstract','Selection by Abstract'),
('Selection by Full Text','Selection by Full Text')]

reviewer = models.ForeignKey(Reviewer, verbose_name=_('Reviewer'),
related_name="%(app_label)s_%(class)s_related", null=False,
blank=False, help_text=_("The reviewer of this paper, at this
stage."))
paper = models.ForeignKey(Paper, verbose_name=_('Paper'),
related_name="%(app_label)s_%(class)s_related", null=False,
blank=False, help_text=_("The reviewed paper."))
review_stage = models.CharField("Review Stage",max_length=30,
choices=STAGES, help_text="The stage for review of this paper.")
include = models.NullBooleanField("Choice",
choices=INCLUDE_CHOICES, default=True, null=False, blank=False,
help_text="Select Include or Exclude for this stage of review.")
exclusion_choice = models.ForeignKey(Exclusion, null=True,
blank=True, related_name="%(app_label)s_%(class)s_related")
exclusion_text = models.TextField(null=True, blank=True)


When I output the cleaned_data from the print at the bottom of the
post method (see above), I get this:
{'reviewer': <Reviewer: Tim Cook>, 'include': True, 'paper': <Paper:
Assessing the quality of clinical data in a computer-based record for
calculating the pneumonia severity index.>, 'exclusion_text': '',
'stage': 'Selection by Title', 'exclusion_choice': None}


Which looks correct, to me. However I am getting an error as if there
is no Reviewer assigned:
IntegrityError at /papers/review_title/3
null value in column "reviewer_id" violates not-null constraint
Request Method:POST

Any ideas?

Thanks,
Tim









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