Python 我可以这样在django模型中使用注释吗？如何使用？

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))

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))

rating_difference

包含玩家评分点

get_rating

应返回积分总和（玩家等级）

template.html

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

---

它工作正常

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))

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 }}

---

它工作正常

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))

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 }}

---

匹配中的

是什么？为什么不试试呢？（您可以这样做）oops
中的匹配项
==
匹配项
中的
是什么
？为什么不试试呢？（您可以这样做）oops
在匹配中
==
匹配