109
Define a related name:
class Price(models.Model):
book = models.ForeignKey(Book, related_name='prices')
and then use it:
books = Book.objects.prefetch_related('prices')
32
When you do not have defined a related_name for the relation, the reverse relation has _set appended. This is the case when accessing the reverse relation from an object (e.g. some_book.price_set.all()), but this also works on prefetch_related:
books = Book.objects.prefetch_related('price_set')
Note that this seems different from filter, which does accept the name of the other model without _set (e.g. Books.objects.filter(price__currency='EUR')).
The above was tested with 1.11.8 (not on this specific code, but on my own, similar code).
Alternatively, you can add a related_name, as shown by Jan Pöschko above.
- [Django]-Modulus % in Django template
- [Django]-WSGI vs uWSGi with Nginx
- [Django]-How can I activate the unaccent extension on an already existing model
Source:stackexchange.com