Django - Cannot assign "'Biography test'": "User.biography" must be a "Biography" instance - django

Question

I have extended the user model with an extra field - biography. It appears in the admin panel as a new section. Here's a picture:
Here's the new model:
class Biography(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
biography = models.TextField(max_length=500, blank=True)
Here's the profile view:
def profile(request, username):
user = get_object_or_404(User, username=username)
products = Product.objects.filter(user=user)
if not request.user == user:
return render(request, 'no.html')
else:
return render(request, 'profile.html', {'user':user,'products': products})
I'm using a form to edit the profile - here's the view:
def edit_profile(request):
user = request.user
products = Product.objects.filter(user=user)
form = EditProfileForm(request.POST or None, initial={'first_name':user.first_name, 'last_name':user.last_name, 'biography':user.biography})
if request.method == 'POST':
if form.is_valid():
user.first_name = request.POST['first_name']
user.last_name = request.POST['last_name']
user.biography = request.POST['biography']
user.save()
return render(request, 'profile.html', {'user':user, 'products':products})
context = {"form": form}
return render(request, "edit_profile.html", context)
...and here's the form:
class EditProfileForm(forms.Form):
first_name = forms.CharField(label='First Name')
last_name = forms.CharField(label='Last Name')
biography = forms.CharField(label='Biography', widget=Textarea(attrs={'rows': 5}))
Here's a screenshot of the error message:
I'm mixing something up but I can't figure out what. Doesn't help that I'm new to this ...still trying!

Answer 1

As the error message says:
"User.Biography" must be a "Biography" instance.
In your edit_profile definition, you have the following assignment:
user.biography = request.POST['biography']
request.POST['biography'] is not a valid instance of Biography. So, you have to create a valid Biography instance, according to your Biography model, with the request.POST['biography'].
After that, you can assign your valid instance to user.biography.
I hope it had been useful for you.