无法保存表单Django

我正在尝试保存表单以更新现有用户，但无法使其正常工作。当我尝试保存表单时发生错误。控制台将在视图中显示错误（内部服务器错误）。

形式：

class updateFirstName(forms.ModelForm):

  class Meta:
    model = User
    fields = ('first_name',)
    def __init__(self, *args, **kwargs):
        super(updateInfoForm, self).__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.form_id = 'id-updateFirst'
        self.helper.form_class = 'blueForms'
        self.helper.form_method = 'post'
        self.helper.form_action = '/login/userInfoChange/'
        self.helper.add_input(Submit('submit', 'Submit'))

看法：

@json_view
@csrf_exempt
def userInfoChange(request):
    context = RequestContext(request)
    if request.method == 'POST':

        user = User.objects.get(username=request.user.username)
        user_form = updateFirstName(request.POST)
        print user_form
        if user_form.is_valid():
                user_form.save()

                print "Valid Form"
                return {'success': True}

的HTML：

<form id="updateUsername">
              <div class="input-group">
                  <span class="input-group-btn">
                  <button class="btn btn-success" type="button" id="submit-username">Change</button>
                  </span>
                   <input type="text" class="form-control" id="id_firstname" placeholder="First Name: {{user.first_name}}">
                   <script type="text/javascript">
                          $('#submit-username').click(function(){

                                  $.ajax({//begin
                                          type: 'POST', 
                                          url:  '/login/userInfoChange/', 
                                          data: $('#updateUsername').serialize(),    
                                          success: function(result){
                                                  console.log('updateUsername');
                                          }
                                        });

                          });

                   </script>
              </div><br></form>

模型：

class UserProfile(models.Model):
       user = models.OneToOneField(User)
       confirmation_code = models.CharField(max_length=128)
       reset_code = models.CharField(max_length=128)
       address_lineOne = models.CharField(max_length=128)
       address_lineTwo = models.CharField(max_length=128)
       city = models.CharField(max_length=128)
       State = models.CharField(max_length=128)
       zipCode = models.CharField(max_length=10)
       def __unicode__(self): 
    return self.user.username

解决方案：

first_name = request.POST.get('first_name')
user.first_name = first_name
user.save()

感谢ejey解决了我的csrf ajax问题。