I'm trying to create a view of type CreateView
. This view will take the form_class = CourseForm
that I created and excluded some fields in it. The instructor
field is a foriegnKey and I don't want the user to be able to control it in the form. It's a field that depends on the signed in user.
# forms.py
class CourseForm(forms.ModelForm):
class Meta:
model = Course
exclude = ['instructor', 'members', 'slug']
# ...
my view is as follows. I thought that by including the instructor value in initial
would pass the profile instance when I submit
# views.py
@method_decorator(login_required, name='dispatch')
class CourseCreateView(CreateView):
model = Course
template_name = 'course_form.html'
success_url = reverse_lazy('course-create-complete')
form_class = CourseForm
def get_initial(self):
initial = super(CourseCreateView, self).get_initial()
initial = initial.copy()
profile = get_object_or_404(Profile, user__username=self.request.user)
initial['instructor'] = profile
return initial
# models.py
class Course(models.Model):
instructor = models.ForeignKey(Profile, related_name="Instructor")
# ... other fields
but the probelm is that whenever I submit the form I get the following error:
NOT NULL constraint failed: myapp_course.instructor_id
If you want to set the initial value of instructor
field, you shouldn't exclude it from the form. You could instead make the field hidden.
Or you could include that in the exclude
list, but then you shouldn't override get_initial
method, but do the assignment manually:
class CourseCreateView(CreateView):
def form_valid(self, form):
self.object = form.save(commit=False)
# create instructor based on self.request.user
self.object.instructor = instructor
self.object.save()
return HttpResponseRedirect(self.get_success_url())
Check django doc about what does save(commit=False)
do.
Also check django doc about form_valid
function and how forms are handled in class based views.