Backbone-Relational and Django-Tastypie: many-to-many fields operating example
from django.db import models

class Author(models.Model):
    name=models.CharField(max_length=42)

class Book(models.Model):
    authors=models.ManyToManyField(Author,related_name='books',through='Authorship')
    title=models.CharField(max_length=42)

class Authorship(models.Model):
    author=models.ForeignKey(Author)
    book=models.ForeignKey(Book)

from tastypie import fields,resources

class AuthorResource(resources.NamespacedModelResource):
    books=fields.ToManyField('library.api.resources.AuthorshipResource','books')

    class Meta:
        resource_name='author'
        queryset=models.Author.objects.all()

class BookResource(resources.NamespacedModelResource):
    authors=fields.ToManyField('library.api.resources.AuthorshipResource','authors')

    class Meta:
        resource_name='book'
        queryset=models.Book.objects.all()

class AuthorshipResource(resources.NamespacedModelResource):
    author=fields.ToOneField('library.api.resources.AuthorResource','author')
    book=fields.ToOneField('.api.resources.BookResource','book')

    class Meta:
        resource_name='authorship'
        queryset=models.Authorship.objects.all()