Django custom template tag using session - django-templates

Question

I have a UpgradeView with the same possibility for saving like in the django admin. I can save, save and continue editing or save and create a new object.
Each leading to a different view:
DetailView, UpdateView and the CreateView.
After saving I want to give a message out, on every view or template its leading to.
For example "Successfully saved" or "Object could not be saved."
When writing custom template tags it's getting really hard for me, because after I created the tag, I don't know how, where and when to pass the message to the other views.
This is the UpdateView where i come from.
class TopicEditView(UpdateView):
fields = ['title','description',]
model = Topic
...
def get_success_url(self):
if self.request.POST.get('save'):
return reverse('topic_detail', kwargs={'pk':self.object.pk})
elif self.request.POST.get('save_and_continue'):
return reverse('topic_edit', kwargs={'pk':self.object.pk})
elif self.request.POST.get('save_and_create_new'):
return reverse('topic_create')
else:
return reverse('fallback_success_url')
My custom template tag is still empty, because the only examples i saw are pretty hard to understand for me.
#register.inclusion_tag('msg.html', takes_context=True)
def get_msg(context):
return None
Inside 'msg.html' i only have the string saying "Successfully saved", this did lead to nothing and i forgot why i did that.
And this is in my template (nothing):
{% load msg_handler %}
{% get_msg %}
How and where can I pass the message to these views using the session?

Answer 1

Try the Django messages framework instead:
http://docs.djangoproject.com/en/1.8/ref/contrib/messages

Answer 2

I got this faster done than I ever thought.
This is my custom template tag:
#register.simple_tag(takes_context=True)
def get_msg(context):
try:
return context.request.session.pop('msg')
except KeyError:
return ''
And this is my view, passing the message:
class TopicEditView(UpdateView):
...
def get_success_url(self):
self.request.session['msg']='Successfully saved!'
...
Nothing have changed in my template.
If there is a more elegant/useful way, i would appreciate it.
EDIT :
Thanks to Lorenzo Peña's comment, i tried using the messages framework which was really easy to use!
First i went to my views.py again and imported messages
from django.contrib import messages
and changed this line
self.request.session['msg']='Successfully saved!'
To this:
messages.add_message(self.request, messages.SUCCESS, 'Successfully saved!')
Then i made a new template called msg_loader.html containing this:
{% if messages %}
<ul class="messages">
{% for message in messages %}
<li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
{% endfor %}
</ul>
{% endif %}
And changed in my other templates this
{% load msg_handler %}
{% get_msg %}
to this
{% include "msg_loader.html" %}