>>> a2 = Article(headline="NASA uses Python")

>>> a2.save()

>>> a2.publications.add(p1, p2)

>>> a2.publications.add(p3)

from django.db import models

​

​

class Publication(models.Model):

    title = models.CharField(max_length=30)

​

    class Meta:

        ordering = ["title"]

​

    def __str__(self):

        return self.title

​

​

class Article(models.Model):

    headline = models.CharField(max_length=100)

    publications = models.ManyToManyField(Publication)

​

    class Meta:

        ordering = ["headline"]

​

    def __str__(self):

        return self.headline

>>> p2.article_set.all()

<QuerySet [<Article: NASA uses Python>]>

>>> p1.article_set.all()

<QuerySet [<Article: Django lets you build web apps easily>, <Article: NASA uses Python>]>

>>> Publication.objects.get(id=4).article_set.all()

<QuerySet [<Article: NASA uses Python>]>

>>> new_article2 = Article.objects.create(

...     headline="Paul's story", pub_date=date(2006, 1, 17), reporter=r

... )

>>> new_article2.reporter

<Reporter: John Smith>

>>> new_article2.reporter.id

1

>>> r.article_set.all()

<QuerySet [<Article: John's second story>, <Article: Paul's story>, <Article: This is a test>]>

>>> Article.objects.filter(publications__id=1)

<QuerySet [<Article: Django lets you build web apps easily>, <Article: NASA uses Python>]>

>>> Article.objects.filter(publications__pk=1)

<QuerySet [<Article: Django lets you build web apps easily>, <Article: NASA uses Python>]>

>>> Article.objects.filter(publications=1)

<QuerySet [<Article: Django lets you build web apps easily>, <Article: NASA uses Python>]>

>>> Article.objects.filter(publications=p1)

<QuerySet [<Article: Django lets you build web apps easily>, <Article: NASA uses Python>]>

​

>>> Article.objects.filter(publications__title__startswith="Science")

<QuerySet [<Article: NASA uses Python>, <Article: NASA uses Python>]>

​

>>> Article.objects.filter(publications__title__startswith="Science").distinct()

<QuerySet [<Article: NASA uses Python>]>