FORMS
class UpdaterForm(forms.ModelForm):
    class Meta:
        model = User
        fields = ('first_name', 'last_name', 'email', 'age', 'city', 'birth_date', 'avatar' )
        widgets = {
            'avatar' : forms.FileInput(attrs={'class' : 'btn draw-border'}),
        }



VIEW
@method_decorator(login_required, name='dispatch')
class UserUpdateView(UpdateView):
    model = User
    form_class = UpdaterForm
    template_name = 'my_account.html'
    success_url = reverse_lazy('my_account')

    def get_object(self):
        return self.request.user





TEMPLATE
  <div class="row">
        <div class="col-lg-6 col-md-8 col-sm-10">
        <form enctype="multipart/form-data" method="post" novalidate>
        {% csrf_token %}
        {{ form.as_p }}
        <button type="submit" class="btn btn-success">Save changes</button>
        </form>
        </div>
    </div>