AttributeError: ProjectUpdateForm object has no attribute 'completed - django-forms

Question

I'm trying to add a checkbox to a form, if true, I want it to add a row to a through model for a manytomanyfield, but I can't access the checkbox variable. Here is the form that I have added it to, and it appears as expected, so half there:
class ProjectUpdateForm(forms.ModelForm):
completed = forms.BooleanField(). # this variable here
class Meta:
model = Update
fields = [
'category',
'update'
]
Here is my view that I was hoping to deal with it:
def project_update_view(request, slug):
obj = Project.objects.get(slug=slug)
if request.method == 'POST':
form = ProjectUpdateForm(request.POST)
form.instance.project = obj
if form.is_valid():
print(f"================{form.completed}") # attempt to find variable
form.save()
return redirect('project-list')
else:
form = ProjectUpdateForm()
context = {
"form": form,
"object": obj
}
return render(request, 'project_portal/project_update.html', context)
This gives me the error in the title. So I now don't understand what an attribute is, I thought it was an aspect of the class represented by a variable. How can I access this checkbox variable so I can work with it please?

Answer 1

This is in the cleaned_data of the form:
def project_update_view(request, slug):
obj = Project.objects.get(slug=slug)
if request.method == 'POST':
form = ProjectUpdateForm(request.POST)
form.instance.project = obj
if form.is_valid():
print(form.cleaned_data['completed'])
form.save()
return redirect('project-list')