title: Saving Django Form produces error: unorderable types: int() > str()
body: <p>I have a form which successfully loads existing data from the PostgreSQL database and fills in the fields so that a user can see their own info in an editable form. But when I press the "Save Changes" button (which loads a view which is programmed to save the data back to the same database entry), I get the following error:</p>
  
  <p>(I changed the actual URL here to simply '/PATH/' for ease-of-reading)</p>
  
  <pre><code>TypeError at /accounts/update_profile/
  
  unorderable types: int() &gt; str()
  
  Request Method:     POST
  Request URL:    http://www.limbs.ca/accounts/update_profile/
  Django Version:     1.7.7
  Exception Type:     TypeError
  Exception Value:    
  
  unorderable types: int() &gt; str()
  
  Exception Location:     /home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/core/validators.py in &lt;lambda&gt;, line 279
  Python Executable:  /usr/local/bin/python3
  Python Version:     3.4.1
  Python Path:    
  
  ['/PATH/lib/python3.4/Django-1.7.7-py3.4.egg',
   '/PATH',
   '/PATH/myproject',
   '/PATH/lib/python3.4',
   '/usr/local/lib/python34.zip',
   '/usr/local/lib/python3.4',
   '/usr/local/lib/python3.4/plat-linux',
   '/usr/local/lib/python3.4/lib-dynload',
   '/usr/local/lib/python3.4/site-packages']
  
  Server time:    Sun, 5 Apr 2015 18:46:17 +0000
  Traceback Switch to copy-and-paste view
  
      /PATH/lib/python3.4/Django-1.7.7-py3.4.egg/django/core/handlers/base.py in get_response
  
                              response = wrapped_callback(request, *callback_args, **callback_kwargs)
  
           ...
      ▶ Local vars
      /PATH/myproject/home/views.py in update_profile
  
              if profile_form.is_valid():
  
           ...
      ▶ Local vars 
  </code></pre>
  
  <p>I think that this error is produced by trying to combine different datatypes. But I haven't explicitly done that. It's being done through some hidden Django process and I can't discover what it is.</p>
  
  <p>Here is the form class in forms.py:</p>
  
  <pre><code>class ProfileForm(ModelForm):
      class Meta:
          model = UserProfile
          fields = ('profile_image', 'country', 'description')
  
      def save(self, commit=True):
          profile = super(ProfileForm, self).save(commit=True)
          profile.profile_image = self.cleaned_data['profile_image']
          profile.country = self.cleaned_data['country']
          profile.description = self.cleaned_data['description']
  
          if commit:
              profile.save()
  
          return profile
  </code></pre>
  
  <p>And here is the view def which tries to save the form data:</p>
  
  <pre><code>def update_profile(request):
      selected_user_id = request.user.id
      selected_user_profile = UserProfile.objects.filter(user_id=selected_user_id)[0]
      profile_form = ProfileForm(request.POST, instance = selected_user_profile)
      if profile_form.is_valid():
          profile_form.save()
          return HttpResponseRedirect('/accounts/profile')
  </code></pre>
  
  <p>And here is the original view which successfully loads the data from the DB and displays it (which the user can then alter, and save, to call the previous view)(IMPORTANT: In this scenario only the ELSE stuff gets called):</p>
  
  <pre><code>def user_profile(request):
      if request.method == 'GET' and 'profile_id' in request.GET:
          profile_id = request.GET.get('profile_id')
          selected_user_profile = UserProfile.objects.get(pk=profile_id)
          selected_user_id = selected_user_profile.user_id
          selected_user = User.objects.get(pk=selected_user_id)
          return render(request, 'reg/other_user_profile.html', {
              'profile': selected_user_profile, 'selected_user': selected_user
              })
      else:
          selected_user_id = request.user.id
          selected_user = request.user
          selected_user_profile = UserProfile.objects.filter(user_id=selected_user_id)[0]
          profile_form = ProfileForm()
          return render(request, 'reg/current_user_profile.html', {
              'profile': selected_user_profile, 'selected_user': selected_user, 'profile_form': profile_form
              })
  </code></pre>
  
  <p>Does anybody know where I'm mixing a string with an int? I really have no idea!</p>
  
  <p><strong>EDIT: Here is the "copy and paste" traceback:</strong>
  (plus a live link to it): <a href="http://dpaste.com/04YYD16" rel="nofollow">http://dpaste.com/04YYD16</a></p>
  
  <pre><code>Environment:
  
  
  Request Method: POST
  Request URL: http://www.limbs.ca/accounts/update_profile/
  
  Django Version: 1.7.7
  Python Version: 3.4.1
  Installed Applications:
  ('django.contrib.admin',
   'django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.messages',
   'django.contrib.staticfiles',
   'testapp',
   'home')
  Installed Middleware:
  ('django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.common.CommonMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware',
   'django.middleware.clickjacking.XFrameOptionsMiddleware')
  
  
  Traceback:
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/core/handlers/base.py" in get_response
    111.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/pattmayne/webapps/limbs_006/myproject/home/views.py" in update_profile
    129.     if profile_form.is_valid():
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/forms/forms.py" in is_valid
    162.         return self.is_bound and not bool(self.errors)
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/forms/forms.py" in errors
    154.             self.full_clean()
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/forms/forms.py" in full_clean
    355.         self._post_clean()
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/forms/models.py" in _post_clean
    422.             self.instance.full_clean(exclude=exclude, validate_unique=False)
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/db/models/base.py" in full_clean
    990.             self.clean_fields(exclude=exclude)
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/db/models/base.py" in clean_fields
    1032.                 setattr(self, f.attname, f.clean(raw_value, self))
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/db/models/fields/__init__.py" in clean
    512.         self.run_validators(value)
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/db/models/fields/__init__.py" in run_validators
    464.                 v(value)
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/core/validators.py" in __call__
    245.         if self.compare(cleaned, self.limit_value):
  File "/home/pattmayne/webapps/limbs_006/lib/python3.4/Django-1.7.7-py3.4.egg/django/core/validators.py" in &lt;lambda&gt;
    279.     compare = lambda self, a, b: a &gt; b
  
  Exception Type: TypeError at /accounts/update_profile/
  Exception Value: unorderable types: int() &gt; str()
  </code></pre>
  
  <p><strong>EDIT #2: Models definitions:</strong></p>
  
  <pre><code>class UserProfile(models.Model):
      country = models.CharField(default="Earth", max_length="50")
      description = models.TextField(default="One more happy user...")
      friends = models.ManyToManyField("self", blank=True, null=True)
      profile_image = models.FileField(upload_to='prof_img/user/%Y/%m/%d', default='prof_img/user/default.jpg')
      user = models.OneToOneField(User)
      def __str__(self):
          return user.username
  </code></pre>