title: unicode' object has no attribute 'get' in Django
body: <p>I am trying to follow the [Django Tutorial 6][1] to do the user authenication. But i get stuck. I am getting this Attribute error: unicode' object has no attribute 'get'. The models,view and forms are provided below. Not sure where the error is... Need some help...</p>
  
  <p>models.py</p>
  
  <pre><code>from django.db import models
  from django.contrib.auth.models import User
  
  class Drinker(models.Model):
  
      user = models.OneToOneField(User)
      birthday = models.DateField()
      name = models.CharField(max_length=100)
  
      def __unicode__(self):
          return self.name
  </code></pre>
  
  <p>views.py</p>
  
  <pre><code>from django.http import HttpResponseRedirect
  from django.shortcuts import render_to_response
  from django.template import RequestContext
  from drinker.forms import RegistrationForm
  from django.contrib.auth.models import User
  from drinker.models import Drinker
  
  
  def DrinkerRegistration(request):
      if request.POST:
          form =RegistrationForm(request.POST)
          if form.is_valid():
              user = User.objects.create_user(username=form.cleaned_data['username'],email=form.cleaned_data['email'])
              password = form.cleaned_data['password']
              user.save()
              drinker=Drinker(user=user,name=form.cleaned_data['name'],birthday=form.cleaned_data['birthday'])
              drinker.save()
              return HttpResponseRedirect('/profile/')
          else:
              return render_to_response('register.html',{'form':form,},context_instance=RequestContext(request))
      else:
          form = RegistrationForm()
          return render_to_response('register.html',{'form':form,},context_instance=RequestContext(request))
  </code></pre>
  
  <p>forms.py</p>
  
  <pre><code>from django import forms
  from django.contrib.auth.models import User
  from django.forms import ModelForm
  from drinker.models import Drinker 
  
  class RegistrationForm(ModelForm):
      username = forms.CharField(label=(u'User Name'))
      email = forms.EmailField(label =(u'Email Address'))
      password = forms.CharField(label =(u'Password'),widget=forms.PasswordInput(render_value=False))
      password1 = forms.CharField(label =(u'Verify Password'),widget=forms.PasswordInput(render_value=False))
  
      class Meta:
          model = Drinker
          exclude = ('user',)
  
      def clean_username(self):
          username = self.cleaned_data['username']
          try:
              User.objects.get(username=username)
          except User.DoesNotExist:
              return username
          raise forms.ValidationError("That username is already taken. Please select another")
      def clean(self):
          password = self.cleaned_data['password']
          password1= self.cleaned_data['password1']
          if password and password1 and password != password1:
              raise forms.ValidationError("The passwords did not match. Please try again")
          return password
  </code></pre>
  
  <p>error:</p>
  
  <pre><code>Environment:
  
  
  Request Method: POST
  
  Django Version: 1.4
  Python Version: 2.7.1
  Installed Applications:
  ('django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.sessions',
   'django.contrib.sites',
   'django.contrib.messages',
   'django.contrib.staticfiles',
   'django.contrib.admin',
   'django.contrib.admindocs',
   'drinker')
  Installed Middleware:
  ('django.middleware.common.CommonMiddleware',
   'django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware')
  
  
  Traceback:
  File "/Users/cnnlakshmen_2000/Projects/env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
    111.                         response = callback(request, *callback_args, **callback_kwargs)
  File "/Users/cnnlakshmen_2000/Projects/Permissions/drinker/views.py" in DrinkerRegistration
    12.       if form.is_valid():
  File "/Users/cnnlakshmen_2000/Projects/env/lib/python2.7/site-packages/django/forms/forms.py" in is_valid
    124.         return self.is_bound and not bool(self.errors)
  File "/Users/cnnlakshmen_2000/Projects/env/lib/python2.7/site-packages/django/forms/forms.py" in _get_errors
    115.             self.full_clean()
  File "/Users/cnnlakshmen_2000/Projects/env/lib/python2.7/site-packages/django/forms/forms.py" in full_clean
    272.         self._post_clean()
  File "/Users/cnnlakshmen_2000/Projects/env/lib/python2.7/site-packages/django/forms/models.py" in _post_clean
    311.         exclude = self._get_validation_exclusions()
  File "/Users/cnnlakshmen_2000/Projects/env/lib/python2.7/site-packages/django/forms/models.py" in _get_validation_exclusions
    297.                 field_value = self.cleaned_data.get(field, None)
  
  Exception Type: AttributeError at /register/
  Exception Value: 'unicode' object has no attribute 'get'
  </code></pre>