Registration Form not submitting in Django

问题

I am doing registration in django using a form with overriding save method. I am not having any error but not submitting form. Following is my code: Models.py:

from django.db import models
from django.contrib.auth.models import User 
class UserProfile(models.Model):
    user=models.OneToOneField(User) 
    meta_keywords=models.CharField("Meta Keywords",max_length=255,
            help_text="Comma delimited set of keywords of meta tag")
    meta_description=models.CharField("Meta Description",max_length=255,
            help_text='Content for description meta tag')

    def __unicode__(self):
        return "User Profile for: "+self.username

    class Meta:
        ordering=['-id']

forms.py

from django.contrib.auth.forms import UserCreationForm
from django import forms
from django.contrib.auth.models import User
from accounts.models import UserProfile
from pprint import pprint


class RegisterationForm(UserCreationForm):
    email = forms.EmailField(label = "Email")
    fullname = forms.CharField(label = "Full name")

    class Meta:
        model = User
        fields = ("username", "fullname", "email", )

    def save(self, commit=True):
        user = super(RegisterationForm, self).save(commit=False)
        first_name, last_name = self.cleaned_data["fullname"].split()
        user.first_name = first_name
        user.last_name = last_name
        user.email = self.cleaned_data["email"]
        if commit:
            user.save()
        return user

views.py

from django.contrib.auth.forms import UserCreationForm
from django.template import RequestContext
from django.shortcuts import render_to_response,get_object_or_404
from django.core import urlresolvers
from django.http import HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from accounts.forms import RegisterationForm
#from accounts.forms import UserProfile

def register(request,template_name="account/register.html"):
    if request.method=='POST':
        postdata=request.POST.copy()
        form=RegisterationForm(postdata)
        if form.is_valid():
            form.save
            un=postdata.get('username','')
            pw=postdata.get('password','')
            from django.contrib.auth import login,authenticate
            new_user=authenticate(username=un,password=pw)
            if new_user and new_user.is_active:
                login(request,new_user)
                url=urlresolvers.reverse('dashboard')
                return HttpResponseRedirect(url)            
    else:
        form=RegisterationForm()
    page_title="User Registration"
    return render_to_response(template_name,locals(),context_instance=RequestContext(request))


@login_required
def dashboard(request):
    pass

@login_required
def settings(request):
    pass

templatefile(register.html):

    <div class="register_form">
    <form method="post" action="." class="cart"> 
        {% csrf_token %}
    {{form.as_p}}
    <input type="submit" value="Register" name="submit" alt="Register" />
    </form>
</div>

After submitting form, it doesn't show any thing except the form again. In db no new records are inserted, I also checked it from admin panel.

I am wondering that what can be the problem because every thing seems fine. Is there some good way to debug problem? some thing like pprint some thing but where to and how to debug in this situation?