How to store a List in a Django model

Question

How can I store a list of Livre for each User in my Django model.py?

Which looks like:

class Livre(models.Model):
    auteur = models.ForeignKey(Auteur)
    titre = models.CharField(max_length=50)
    genre = models.ForeignKey(Genre)
    publish_date = models.DateField()

I want my User can as much Livre as they want (0 is possible):

from django.db import models
from django.contrib.auth.models import User

class Lecteur(User):
    bibliotheque = models.??????(Livre)

... without touching the Livre model.

To make is short I want a OneToMany relationship from User to Livre.

Answer 1

Just add a ManyToManyField in the User model.

You want in fact a ManyToMany relation rather than a OneToMany relation, because you want multiple users be able to have the same Livre linked to them, right?

If not, you could restrict that by overriding the save() method (just add checks), or you could argue that this should be in fact the responsibility of Livre, and add ForeignKey there.

You can find more about ManyToManyField here: https://docs.djangoproject.com/en/dev/topics/db/examples/many_to_many/