There's currently a patch https://github.com/django/django/pull/7560 for
ticket https://code.djangoproject.com/ticket/27332 that implements custom
join conditions. It was nearly ready for merge for 1.11 but slipped. There
are some merge conflicts the author still needs to sort out, but nothing
too onerous.
Example:
Author.objects
.filtered_relation(
'book', alias='book_alice',
condition=Q(book__title__iexact='poem by alice')
)
It has received very little attention and I'd like to get it on the radar
for folks that would like to see this implemented, and have some time to do
review. I'll be trying to get some review done in the next few days
depending on my schedule.
One minor concern I did have was with the naming of the `filtered_relation`
queryset method. I was leaning towards `filter_related` to better align
with select_related and prefetch_related but I'm not sure that's better, or
if it gives the wrong idea about what the method does. It might also be
worth renaming the `alias` kwarg to `to_attr` to align with
prefetch_related API. (Even if you don't have time to review, bikeshedding
names seems to be popular 'round these parts :) ).
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