nonrel with mongodb relations

I'm converting django with MySQL to django-nonrel with mongodb. The biggest issue is the many to many relations. I saw that ListField of models.ForeignKey doesn't work as expected.

Lets say that a Person can write many Posts, and each Post can be written by many Persons. So the solution I've now seems to me really not efficient:

class Person(models.Model):
    first_name = models.TextField()
    posts = ListField(models.ForeignKey('Post'))

    def get_posts(self):
        posts_list = []
        for post_oid in self.posts:
            author = Post.objects.get(id=post_oid)
            posts_list.append(author)
    return posts_list

class Post(models.Model):
    text = models.TextField()
    authors = ListField(models.ForeignKey(Person))

    def add_author(self, person):
        if self.has_author(person):
            return
        person.posts.append(ObjectId(self.id))
        person.save()
        self.authors.append(ObjectId(person.id))
        self.save()

    def get_authors(self):
        authors_list = []
        for person_oid in self.authors:
        author = Person.objects.get(id=person_oid)
            authors_list.append(author)
        return authors_list

    def has_author(self, person):
        return ObjectId(person.id) in self.authors

what is the right way to do it?

I saw How to convert django ManyToManyField into Django-nonrel Field? but it didn't work for me for some reason.

I'm using Django-nonrel 1.5

Thanks!

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