我可以在django模型中使用这样的注释吗？

Question

models.py

matches = models.ManyToManyField('Matches')
...
def get_rating(self):
  from django.db.models import Sum, Value, IntegerField
  from django.db.models.functions import Coalesce

  return self.matches.annotate(rating=Coalesce(Sum('matches__rating_difference'), Value(0), output_field=IntegerField()) + Value(1000))

rating_difference包含玩家评分

get_rating应该返回积分总和（玩家评分）

template.html

{{ player.matches.get_rating.(?)rating }}

Answer 1

有效

models.py

matches = models.ManyToManyField('Matches')
...
def get_rating(self):
  from django.db.models import Sum, Value, IntegerField
  from django.db.models.functions import Coalesce

  return self.matches.aggregate(rating=Coalesce(Sum('rating_difference'), Value(0), output_field=IntegerField()) + Value(1000))

template.py

{{ player.matches.get_rating.rating_difference }}