Prefetch object (django 1.7)

Hello,

I have a model

class Post(models.Model):

...
authors = models.ManyToManyField('accounts.User', through='PostAuthor', related_name='authors_posts')


class PostAuthor(models.Model):

user = models.ForeignKey('accounts.User')
post = models.ForeignKey(Post)
...


How can I use the Django 1.7 Prefetch object to load PostAuthors, this
does not work:

Post.objects.prefetch_related(
Prefetch(
'authors',
queryset=PostAuthors.object.select_related('user')
)

I got an exception:
django.core.exceptions.FieldError: Cannot resolve keyword 'authors_posts' into field. Choices are: created, id, post, post_id,
user, user_id

Thanks for help,
Marcin Szamotulski

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