Django update queryset with annotation

Question

I want to update all rows in queryset by using annotated value.

I have a simple models:

class Relation(models.Model):
    rating = models.IntegerFiel         


        

Answer 1

You can define your own custom objects manager:

class RelationManager(models.Manager):
    def annotated(self,*args,*kwargs):
         queryset = super(RelationManager,self).get_queryset()
         for obj in queryset:
               obj.rating = ... do something ...
         return queryset

class Relations(models.Model):
    rating = models.IntegerField(default=0)
    rating_objects = RelationManager()

Then in your code:

q = Realation.rating_objects.annotated()

Add args/kwargs to customise what this manager returns.