Hi guys,

i am working on user CRUD. 
I am using one form for user creation and update. When user is initially 
created it is ok to perform password validation - users must have password, 
but in my edit form i want to have a logic like: when nothing is entered 
don't do anything, when user enters something in password field override 
old password. The problem is that password field is always mandatory. Is 
there some way to disable validation according to my logic.

This is my form
from django import forms
from django.contrib.auth.models import User

class UserForm(forms.ModelForm):
    password = forms.CharField(widget=forms.PasswordInput)

    class Meta:
        model = User
        exclude = ('last_login', 'date_joined')

    def save(self, commit=True):
        user = super(UserForm, self).save(commit=False)
        password = self.cleaned_data["password"]
        if user.pk:
            if password:
                user.set_password(self.cleaned_data["password"])
        else:
            user.set_password(self.cleaned_data["password"])
        if commit:
            user.save()
        return user

and my view
@login_required
@user_passes_test(lambda u: u.groups.filter(name='Users').count() == 1, 
login_url='/access-denied/')
def form(request, pk=None):
    if request.POST:
        if pk:
            target = User.objects.get(pk=pk)
            form = UserForm(request.POST, instance=target)
        else:
            form = UserForm(request.POST)

        if form.is_valid():
            form.save()
            return HttpResponseRedirect('/user/list')
    else:
        if pk:
            target = User.objects.get(pk=pk)
            form = UserForm(instance=target)
        else:
            form = UserForm()

    args = {}
    args.update(csrf(request))

    args['form'] = form

    return render_to_response('users/form.html', args, 
context_instance=RequestContext(request))

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