Unable to serialize a not yet saved model which has many-to-many relation.

[Bear]

If I try to serialize a not yet saved model which has many-to-many relation, it will raise ValueError while serialize many-to-many field.

for instance:

from django.contrib.auth.models import User

u = User(username="bear", password="bear", email="blp330@…")

from django.core import serializers

serializers.serialize("json", [u])

=>

ValueError: <class 'django.contrib.auth.models.Group'> instance needs to have a
primary key value before a many-to-many relationship can be used.

This makes inconvenient while use ajax in some situation.

[Russell Keith-Magee]

Serialization is only intended for use of objects that are saved and in the database. Unless you can provide an example of where AJAX would require the serialization of an incomplete object, I'm marking this wontfix.