When I make my form ajax it does not save image to model

Question

My model works good when page makes POST request but when it makes it makes ajax request it stops saving an image( I can not change image to another), rest fields works good. What can be the problem? Here is my model:

class Contact(models.Model):
    name = models.CharField(max_length=40, blank=False)
    last_name = models.CharField(max_length=40, blank=False)
    date_of_birth = models.DateField(blank=True, null=True)
    bio = models.TextField(blank=True)
    contacts = models.TextField(blank=True)
    email = models.EmailField(blank=True)
    jabber = models.CharField(max_length=40)
    skype = models.CharField(max_length=40)
    other_contacts = models.TextField(blank=True)
    photo = models.ImageField(upload_to='photo/', null=True)

Ajax function:

$(function(){
    var form = $('#contact_form');
    form.submit(function(e){
        $('#sendbutton').attr('disabled', true)
        $('#ajax-progress-indicator').show();
        $('#ajaxwrapper').load('/1/edit/' + '#ajaxwrapper',
            form.serializeArray(), function(responseText, responseStatus) {
                $('sendbutton').attr('disabled', false)
                $('#ajax-progress-indicator').hide();
            });
        e.preventDefault();
    });

});

Urls:

urlpatterns = patterns(
    '',
    # Examples:
    url(r'^$', 'apps.hello.views.home', name='home'),    
)

from .settings import MEDIA_ROOT, DEBUG


if DEBUG:
# serve files from media folder
        urlpatterns += patterns('',
                url(r'^uploads/(?P<path>.*)$', 'django.views.static.serve', {
                        'document_root': MEDIA_ROOT}))

Form:

class ContactForm(forms.ModelForm):
    """
    The model for Contact model edit
    """
    # other_contacts = forms.CharField(widget=PreformattedTextWidget)
    class Meta:
        model = Contact
        fields = ['name', 'last_name', 'date_of_birth', 'bio', 'contacts', 
            'email', 'jabber', 'skype', 'other_contacts', 'photo']
        widgets = {
            'skype': forms.Textarea(attrs={'placeholder': 'Enter your skype ID'}),
            # 'other_contacts': PreformattedTextWidget()
        }

View class:

class ContactUpdateView(UpdateView):
    model = Contact
    form_class = ContactForm
    template_name = 'edit.html'

    def get_success_url(self):
        return reverse('home')


    def post(self, request, *args, **kwargs):
        if request.POST.get('cancel_button'):
            return HttpResponseRedirect(
                u'%s?status_message=Canceled!'
                    %reverse('home'))
        else:
            return super(ContactUpdateView, self).post(request, *args,
                     **kwargs)
    def get_ajax(self, request, *args, **kwargs):
        return render(request, 'home.html')