NotifyMixin and NotifyCreateView

example.py

#import stuff like NotifyCreateView and ProjectForm

class ProjectCreate(NotifyCreateView):
    login_required = True
    form_class = ProjectForm

views.py

from django.views.generic.edit import CreateView
from django.contrib import messages
from django.utils.translation import ugettext as _

if "notification" in getattr(settings, "INSTALLED_APPS"):
    from notification import models as notification
else:
    notification = None

class NotifyMixin(object):
    
    valid_type = messages.SUCCESS
    valid_message = None
    valid_flash = True

    invalid_type = messages.ERROR
    invalid_message = _("Some validation errors where found on the submitted form.")
    invalid_flash = True
    
    notify_list = None
    notify_template = None
    
    def show_invalid_flash(self):
        if self.invalid_flash:
            messages.add_message(self.request, self.invalid_type, self.invalid_message)
            
    def show_valid_flash(self):
        self.valid_message = _("The %s has been added successfully" % self.object._meta.verbose_name)
        if self.valid_flash:
            messages.add_message(self.request, self.valid_type, self.valid_message)
    
    def send_notification(self):
        if notification and self.notify_list and self.notify_template:
            notification.send(self.notify_list,
                              self.notify_template,
                              self.get_context_data())

    
class NotifyCreateView(CreateView, NotifyMixin):
    def form_valid(self, form):
        ret = super(NotifyCreateView, self).form_valid(form)
        self.show_valid_flash()
        self.send_notification()
        return ret
        
    def form_invalid(self, form, **kwargs):
        show_invalid_flash()
        return self.render_to_response(self.get_context_data(form=form))