Struggling with many to many field - django

Question

I'm trying to create a new product.
Here is my model :
class Product(models.Model) :
door = models.ForeignKey(Door, on_delete=models.CASCADE)
options = models.ManyToManyField(Option)
Here is my views :
def new_product(request, door_id) :
door = get_object_or_404(Door, id=door_id)
checked = request.POST.getlist('checks[]')
c_checked = []
for check in checked :
new_check = get_object_or_404(Option, name=check)
c_checked.append(new_check)
product = Product.objects.create(
door = door,
options = c_checked,
)
product.save()
return render(request, "confirmation.html")
Unfortunately, when I run the server, I get an error saying :
Direct assignment to the forward side of a many-to-many set is
prohibited. Use options.set() instead
Please help me if you have the answer.
.

Answer 1

According to the documentation, you should use add. create method represents one insert in a database but you want to insert multiple records.
def new_product(request, door_id) :
door = get_object_or_404(Door, id=door_id)
checked = request.POST.getlist('checks[]')
c_checked = []
for check in checked :
new_check = get_object_or_404(Option, name=check)
c_checked.append(new_check)
product = Product.objects.create(door=door)
product.options.add(*c_checked)
return render(request, "confirmation.html")