Send message to all Users in Django

August 9, 2022

i was about to create a function that sends message to all members Using forloop
but then i thought that this method gonna take alot of time in process if there is a plenty of members…

so i came to ask if is there any better method to ignore forloop and smooth the process.

Model:

class TblExamNotification(models.Model):

    exam = ForeignKey(TblExam,on_delete=models.CASCADE,blank=True, null=True)
    user = ForeignKey(Members,on_delete=models.CASCADE,blank=True, null=True)
    is_seen = BooleanField(default=False)

    def __str__(self):
        return str(self.id)

Views:

for member in memebers.exclude(member = request.user):
           notif_obj = Members.objects.create(user=member , exam=exam_obj)
           notif_obj .save()

>Solution :

First create a list of all notifications you want to use, then save these in bulk with bulk_create(…) ^[Django-doc]:

items = [
    TblExamNotification(user=member , exam=exam_obj)
    for member in memebers.exclude(member=request.user)
]

TblExamNotification.objects.bulk_create(items)

The bottleneck is (very) likely not the for loop itself, but the fact that you used a lot of queries to the database.