Question

I have the following Django model:

class Make:
   name = models.CharField(max_length=200)

class MakeContent:
   make = models.ForeignKey(Make)
   published = models.BooleanField()

I’d like to know if it’s possible (without writing SQL directly) for me to generate a queryset that contains all Makes and each one’s related MakeContents where published = True.

Answer 1

Django doesn’t support the select_related() method for reverse foreign key lookups, so the best you can do without leaving Python is two database queries. The first is to grab all the Makes that contain MakeContents where published = True, and the second is to grab all the MakeContents where published = True. You then have to loop through and arrange the data how you want it. Here’s a good article about how to do this:

http://blog.roseman.org.uk/2010/01/11/django-patterns-part-2-efficient-reverse-lookups/