save() prohibited to prevent data loss due to unsaved related object 'log' - django

Question

I am new to django.. I cannot understand what is this error. Can someone help me solve this issue?
Traceback (most recent call last):
File "C:\Error logger\venv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Error logger\venv\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Error logger\errorLogger\log\views.py", line 130, in add_solution
s.save()
File "C:\Error logger\errorLogger\log\models.py", line 41, in save
super().save(*args, **kwargs)
File "C:\Error logger\venv\lib\site-packages\django\db\models\base.py", line 682, in save
self._prepare_related_fields_for_save(operation_name='save')
File "C:\Error logger\venv\lib\site-packages\django\db\models\base.py", line 932, in _prepare_related_fields_for_save
raise ValueError(
Exception Type: ValueError at /add-solution/4/my-name-is-anirudh
Exception Value: save() prohibited to prevent data loss due to unsaved related object 'log'.
Also can someone explain what does the below do? I found that this is needed for slug urls.. But I don't understand what is super().save()
def save(self, *args, **kwargs):
self.slug = self.slug or slugify(self.solution)
super().save(*args, **kwargs)
Also what is the error that I am getting?
models.py
class Solutions(models.Model):
log = models.ForeignKey(
Log, on_delete=models.CASCADE, blank=True, null=True)
solution = models.TextField(null=True)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
slug = models.SlugField(max_length=50, null=False, blank=True)
image = models.ImageField(
upload_to='images', blank=True)
def save(self, *args, **kwargs):
self.slug = self.slug or slugify(self.solution)
super().save(*args, **kwargs)
class Meta:
verbose_name = ("Solution")
verbose_name_plural = ("Solutions")
def __str__(self):
return f" {self.solution} "
views.py
def add_solution(request, id, solution):
log = Log()
if request.method == 'POST':
form = SolutionForm(request.POST, request.FILES)
if form.is_valid():
sol = form.cleaned_data['solution']
image = request.FILES.get('image')
s = Solutions()
s.solution = sol
s.image = image
s.log = log
s.save()
message = messages.add_message(request, 25,
'Solution added successfully')
return HttpResponseRedirect(f'/solution/{id}/{solution}')
else:
form = SolutionForm()
message = ''
try:
solution = Solutions.objects.filter(id=id).first()
print(solution)
except Solutions.DoesNotExist:
solution = ''
context = {
'form': form,
'message': message,
'solution': solution
}
return render(request, 'add_solution.html', context=context)
Thanks

Answer 1

You need to save the log first, so add
s.log.save()
Before
s.save()