How to perform translation from RAW SQL to django queryset - sql

Question

I am struggling with conversion to django query having raw sql
I am new in django and any help will be appreciated
There are simple models:
Winemaker - target model
Wine
Post
Winemaker has 1+ Wines
Wine has 1+ Posts
I know that it should be done with annotations but have no idea how to implement it.
select w2.*,
(select count(wp.id)
from web_winemaker www
inner join web_wine ww on www.id = ww.winemaker_id
inner join web_post wp on ww.id = wp.wine_id
where
ww.status=20
and
wp.status=20
and
www.id = w2.id
) as wineposts_count,
(
select count(w.id)
from web_winemaker www1
inner join web_wine w on www1.id = w.winemaker_id
where
w.status=20
and www1.id = w2.id
) as wines_count
from web_winemaker w2;

Answer 1

You should be able to accomplish this with a Count aggregation expression in an annotate function. I took a guess at your related_name values on your relationship fields, so the following code may not plug in directly, but should give you an idea of how to do what you want.
from django.db.models import Count, Q
wine_makers = Winemaker.objects.annotate(
posts_count=Count(
'wine__post__id',
filter=Q(wines__status=20, wines__posts__status=20),
),
wines_count=Count(
'wines__id',
filter=Q(wines__status=20),
),
)
You may need to supply distinct=True depending on if you're crossing relationships.