login form

forms.py

class LoginForm(forms.Form):

    username = forms.CharField(label="Username", max_length=30)
    password = forms.CharField(label="Password", widget=forms.PasswordInput)

    @property
    def helper(self):
        form = LoginForm()
        helper = FormHelper()
        reset = Reset('','Reset')
        helper.add_input(reset)
        submit = Submit('','Log In')
        helper.add_input(submit)
        helper.form_action = '/accounts/login'
        helper.form_method = 'POST'
        return helper

    def clean(self):
        username = self.cleaned_data.get('username')
        password = self.cleaned_data.get('password')

        if username and password:
            self.user_cache = authenticate(username=username, password=password)
            if self.user_cache is None:
                raise forms.ValidationError("Please enter a correct username and password. Note that both fields are case-sensitive.")
            elif not self.user_cache.is_active:
                raise forms.ValidationError("This account is inactive.")
        return self.cleaned_data