Message notification in django - django

Question

i have simple message model in my study project.
class Message(models.Model):
sender = models.ForeignKey(CustomUser, related_name='sender')
reciever = models.ForeignKey(CustomUser, related_name='reciever')
text = models.TextField()
created_at = models.DateTimeField(auto_now_add=True)
How can I send notification to request.user about new message.
i.e. I need send notification to request.user if I have new Message object with request.user in reciever field
UPD my view:
def dialog(request, user_pk):
sent = Message.objects.filter(reciever_id=user_pk, sender_id=request.user.pk)
recieved = Message.objects.filter(reciever_id=request.user.pk, sender_id=user_pk)
mate = CustomUser.objects.get(pk=user_pk)
dialog_list = sorted(chain(sent, recieved), key=lambda a:a.created_at)
if request.POST:
form = MessageForm(request.POST)
if form.is_valid():
f = form.save(commit=False)
f.sender = CustomUser.objects.get(pk=request.user.pk)
f.reciever = CustomUser.objects.get(pk=user_pk)
form.save()
else:
form=MessageForm()
return render(request, 'dialog.html', {'sent':sent,
'recieved':recieved, 'form':form, 'mate':mate, 'dialog_list':dialog_list})
look's like this:

Answer 1

I solved this problem by making some ugly logic
Update my model with boolean field:
class Message(models.Model):
sender = models.ForeignKey(CustomUser, related_name='sender')
reciever = models.ForeignKey(CustomUser, related_name='reciever')
text = models.TextField(verbose_name='')
created_at = models.DateTimeField(auto_now_add=True)
is_readed = models.BooleanField(default=False)
In view I create set for my message and add users here, who have messages with is_readed == False
It become True when we load dialog page with this user
I never working in real project, but I think this solution unacceptable here.
Anyway in my first study project it's worked, maybe it helped some newbies, like meemphasized text
def dialog(request, user_pk):
sent = Message.objects.filter(reciever_id=user_pk, sender_id=request.user.pk)
recieved = Message.objects.filter(reciever_id=request.user.pk, sender_id=user_pk)
not_readed = set()
for message in recieved:
message.is_readed = True
message.save()
for message in Message.objects.filter(reciever_id=request.user.pk):
if message.is_readed ==False:
not_readed.add(CustomUser.objects.get(pk=message.sender_id))
dialog_list = sorted(chain(sent, recieved), key=lambda a:a.created_at)
if request.POST:
form = MessageForm(request.POST)
if form.is_valid():
f = form.save(commit=False)
f.sender = CustomUser.objects.get(pk=request.user.pk)
f.reciever = CustomUser.objects.get(pk=user_pk)
form.save()
else:
form=MessageForm()
return render(request, 'dialog.html', {'sent':sent,
'recieved':recieved, 'form':form, 'mate':mate,
'dialog_list':dialog_list, 'not_readed':not_readed})