[英]django sort by manytomany relationship
I have the following model:我有以下模型:
class Service(models.Model):
ratings = models.ManyToManyField(User)
Now if I wanna get all the service with ratings sorted in descending order I did something:现在,如果我想获得按降序排序的所有服务,我做了一些事情:
services_list = Service.objects.filter(ratings__gt=0).distinct()
services_list = list(services_list)
services_list.sort(key=lambda service: service.ratings.all().count(), reverse=True)
As you can see its a three step process and I don't feel right about this.正如你所看到的,它是一个三步过程,我对此感觉不对。 Anybody who knows a better way to do this?
有谁知道更好的方法来做到这一点?
How about:怎么样:
from django.db.models import Count
service_list = Service.objects.annotate(ratings_num=Count('ratings')).filter(ratings_num__gt=0).order_by('-ratings_num')
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