Hi there!
I have User model and serializer class which represents it.
*class User(models.Model):*
* username = models.CharField(unique=True, max_length=50)*
* is_admin = models.BooleanField(default=False)*
*class CreateUserSerializer(serializers.ModelSerializer):*
* class Meta:*
* model = User*
* fields = ("username", "is_admin")*
* def create(self, validated_data: Dict[str, Any]) -> User:*
* username = validated_data["username"]*
* try:*
* user_object = User.objects.create(username=username)*
* except IntegrityError:*
* raise UserAlreadyRegistered()*
* return user_object*
My database holds lots of users(appr. 10 million). When I create another
user, Django Rest Framework look at the model fields and check that if
there are any unique=True fields.
If there are, then it assigns "UniqueValidator". This validator calls
"filter_queryset" which means it query the database and check that
are there any given username record. If there are not, then it creates the
user.
My question is, why DRF make a query before create operation? Since
database(PostgreSQL) holds the field attributes, it knows that
username field is unique, and it can throw an exception if I try to create
user with the same username field. The reason I'm asking it, my application
gets a lot of create operation, and each create operation I have to query
my database, which is I think more costly than create it wihout making a
filter query.
Do I missing something in this operation?
Thanks!
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