NOT NULL constraint failed error - django

Question

I want to select an event and upload a photo, but when I make migrations, it gives
NOT NULL constraint failed: myapp_doc.event error.
I'm getting the error even after deleting the view. What should I do ?
models
class Doc(models.Model):
events = (
(None, "choose one of it"),
('bbq', 'Barbeque '),
('meet', 'Meeting'),
)
doc = models.FileField(upload_to='uploads/')
user = models.ForeignKey(User, null=False, blank=True)
event = models.CharField(max_length=15, choices=events, null = True)
def __unicode__(self):
return unicode(self.user)
View
def upload_file(request):
user= request.user
form = UploadFileForm(request.POST, request.FILES)
if form.is_valid():
doc = form.save(commit=False)
doc.user = request.user
doc.save()
messages.success(request, 'Dosya Yuklendi')
return HttpResponseRedirect('/uploadnew/')
return render(request, 'upload.html', {'form': form})
def upload_file(request):
user= request.user
form = UploadFileForm(request.POST, request.FILES)
if form.is_valid():
doc = form.save(commit=False)
doc.user = request.user
doc.save()
messages.success(request, 'Dosya Yuklendi')
return HttpResponseRedirect('/uploadnew/')
return render(request, 'upload.html', {'form': form})

Answer 1

Okay I got your problem.
In models.py, you are defining the null = True option for the event column which is of the type models.CharField.
event = models.CharField(max_length=15, choices=events, null = True)
But as a matter of fact, 'CharField' doesn't have the null option in it.
Only the 'max_length' option is available.
See this -> https://docs.djangoproject.com/en/1.9/ref/models/fields/
So technically, you need to remove that null = True part and if you really want to allow the user of your web-app to have the freedom of not selecting any option, then you can add a default value to your event column which will pick a default value from the choices defined by you in the events column.
See the example in the official docs. It's the same as what you want -> https://docs.djangoproject.com/en/1.9/ref/models/fields/#django.db.models.Field.choices
So you event column will finally look something like this, if your default value is Barbeque:
event = models.CharField(max_length=15, choices=events, default=bbq)
Also, as shown in the official docs, I don't think you need the single quotes around 'bbq' or 'meet'.
I hope this will solve your problem.