forms - Editing users in Django -

i trying to edit user using form used create user, have no idea why i'm getting error user username exists.

here view:

def registration_edit(request):     """ registration step2:                                user should authenticated reach step.                                authentication provided first step or user login.     """     if request.user.is_authenticated():         if request.post:             form = registrationform(request.post or none, instance=request.user)             if form.is_valid():                 form.save()                 return httpresponseredirect(reverse('reg_step_2'))         else:             form = registrationform(instance=request.user)         page = 'account'           title = 'editing user registration'         context = {'title': title, 'form': form, 'page': page}         template = 'customer/registration.djhtml'         return render_to_response(template, context, context_instance=requestcontext(request))             else:         messages.info(request, '<strong>note</strong>: must logged in edit account.')         return httpresponseredirect('/') 

forms.py did form because want include firstname , lastname field included on registration.

    django import forms     django.contrib.auth.models import user     django.contrib.auth.forms import usercreationform      class registrationform(usercreationform):         class meta:             model = user             exclude = ('is_staff', 'is_active', 'is_superuser', 'last_login', 'date_joined', 'groups', 'user_permissions', 'password') 

and here template

<form class="form-horizontal" action='.' method="post">     {% csrf_token %}     <fieldset>         <div id="legend">             <legend class="">                 {{ title|title }}             </legend>         </div>         {% f in form %}         <div class="control-group">             <label class="control-label"  for="username">{{ f.label }}</label>             <div class="controls">                 {{ f }}&nbsp;<i style="color: orange">{{ f.errors|striptags }}</i>             </div>         </div>         {% endfor %}         <div class="controls">             <button class="btn btn-success">                 continue             </button>         </div>     </fieldset> </form> 

anyone tell me messing around here? appreciated.

your inherits usercreationform cleans username field.

in case see userchangeform instead.