Question

I am building a very simple app that requests users to add the name of a city into a poll and then creates a frequency distribution of entered cities. My view for some reason is not retrieving City objects from the database by their name (primary key). Specifically, the first assignment after try: is not going through, according to my trace statements. Must be overlooking something really obvious as I’m a novice. Please advise.

models.py:

from django.db import models

class City(models.Model):
    name = models.CharField(max_length='20', primary_key=True)
    count = 0

views.py:

def save(request):
name = request.POST['city_name']
try:
    city = City.objects.get(pk=name)
    print 'city does exist'
    city.count += 1
except City.DoesNotExist:
    print 'city does not exist'
    city = City()
    city.name = name
    city.count += 1
city.save()
return render_to_response('thanks.html', {'city_name':name})

Answer 1

You need to call city.save() after changing city.count

You will need to do this in the try block and except block.