django IntegrityError (1048, "Column 'hotel_id' cannot be null") - django

Question

I am new and this is my first question on this platform. am trying to add new rooms using modelform but am getting IntegrityError (1048, "Column 'hotel_id' cannot be null"). My code is as below. I appreciate the help
models.py
class Hotel(models.Model):
name = models.CharField("Hotel Name", max_length=100)
owner = models.OneToOneField(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
class Meta:
verbose_name_plural = "Hotels"
def __str__(self):
return self.name
class Rooms(models.Model):
room_type = models.CharField(max_length=100)
price = MoneyField(max_digits=65, decimal_places=2, default_currency='USD')
number_available = models.IntegerField()
hotel = models.ForeignKey(Hotel,on_delete=models.CASCADE)
# hotel = models.ForeignKey("Hotel", on_delete=models.CASCADE)
class Meta:
verbose_name_plural = "Rooms"
def __str__(self):
return self.room_type
views.py
Here is the view part to process the form
def new_room(request):
if request.method=='POST':
# hotel = get_object_or_404(Hotel,id =hotel_id)
user = request.user
if user:
form=RoomsForm(request.POST or None)
if form.is_valid():
newroom = form.save(commit=False)
newroom.owner = request.user
newroom.save()
return HttpResponseRedirect('/')
else:
form = RoomsForm(request.POST or None)
return render(request,'newroom_form.html', {"form":form})
forms.py
class RoomsForm(forms.ModelForm):
class Meta:
model = Rooms
fields =['room_type','price','number_available']
Thank you in advance

Answer 1

The RoomsForm doesn't contain the hotel field, so newroom.hotel isn't populated. When you save() the instance Postgres complains about the missing value (ForeignKey defaults to null=False).
Since you probably don't want to allow rooms in unknown hotels you need to either include the hotel choice in the form or include the hotel id in your url (e.g. /hotel/123/new-room/) and set newroom.hotel manually.

Answer 2

I was able to get the hotel id by using the below code
def new_room(request):
if request.method == 'POST':
form = RoomsForm(request.POST or None)
if form.is_valid():
instance = form.save(commit=False)
rooms = Rooms.objects.filter(hotel__owner=request.user)
for r in rooms:
instance.hotel_id = r.hotel_id
instance.user = request.user
instance.save()
return HttpResponseRedirect('/dashboard')
else:
form = RoomsForm()
return render(request, 'newroom_form.html', {"form": form})