title: How do you use Django-filter's '__in' lookup?
body: <p>I am using Django REST framework with the <a href="https://github.com/carltongibson/django-filter" rel="nofollow noreferrer"><code>django-filter</code></a> package, but my question is mostly about <code>django-filter</code>. I don't understand how to use filters with &quot;__in&quot; lookup.</p>
  <p>For example I have the following model:</p>
  <pre><code>class Book(models.Model):
     name = models.CharField(max_length=100)
  
  class BookView(viewsets.ReadOnlyModelViewSet):
     serializer_class = BookSerializer()
     model = Book
     filter_fields = ('id', 'name')
  </code></pre>
  <p>And I can't use URLs like <code>/v1/books/?id__in=1,2,3</code> to find books with id 1, 2 or 3.</p>
  <p>How do you use Django-filter's '__in' lookup?</p>