Django query not working

Here's the thing. I have a model called User and an attribute counter that counts the number of page access. So, if a user already exists, I have to query up the db and for that user only to increase in counter. Otherwise, create a new user. I have an an开发者_如何学编程noying error in the get method. How can I surpass it?

if request.method == 'POST':
        form = UserForm(request.POST)
        if form.is_valid():
            u = form.save()
            try:
                obj = User.objects.get(user=u.user)
                obj.counter += 1
                obj.ipaddress = request.META['REMOTE_ADDR']
                obj.save()
            except Statistic.DoesNotExist:
                ip = request.META['REMOTE_ADDR']
                obj = User(user=u.user, counter=1, ipaddress=ip)
                obj.save()
            return {'status': 'OK'}
        else:
            return {'errors': form.errors}
    return {'status': 'NOT OK. GET method'}

get() returned more than one User -- it returned 2! Lookup parameters were 

Django has amazing documentation on their QuerySet API. https://docs.djangoproject.com/en/dev/ref/models/querysets/

get only returns exactly 1 queryset. If no queryset is found, or more then 1 queryset is returned, an error is raised. To catch this particular error you have to specify except User.MultipleObjectsReturned,

This means there are multiple users matching the query in your database. get should be used to fetch only one. It seems you are already coding for this but I think you are catching the wrong exception type. Try changing

except Statistic.DoesNotExist:

To

from django.core.exceptions import DoesNotExist
except DoesNotExist: