早安,
我的问题是:
我的项目取决于为进行任何操作(例如发布,评论,收藏,喜欢......)的用户提供积分。
因此,在用户列表页面中,我要列出所有用户以及每个用户的其他数据(名称,要点,徽章等。)
要给用户点数,我必须计算他的帖子,评论,喜欢的次数,等等.....
我尝试了几种方法和方法,但是都无法获得注释或prefetch_related或select_related
Models.py
class Post(models.Model):
title = models.CharField(max_length=100)
content = models.TextField()
author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='posts')
Views.py
def user_list(request):
users = User.objects.all()
template = 'user/users_list.html'
nested_posts = {}
for user in users:
posts = user.posts.all()
nested_posts[user, posts] = posts.count()
print("nested : ", nested_posts)
context = {
'users': users,
'user':user,
'posts': posts,
'nested_posts': nested_posts,}
return render(request, template, context)
当我打印嵌套的..时,我发现每个用户的帖子数..但是如何将其作为变量在计算字段中重复使用
QuerySet
nested : {(<User: Fareed>, <QuerySet [<Post: Senior Purchasing Specialist>]>): 1,
(<User: Hussein>, <QuerySet [<Post: Senior Software Development Engineer in Test>]>): 1,
(<User: Karima>, <QuerySet []>): 0,
(<User: Yahia>, <QuerySet []>): 0}
而且我也尝试过:
GetUserID = User.objects.get(id=2)
var01 = GetUserID.posts.all().count()
但这是针对(id = 2)..的一个用户,并且确保所有用户都没有获得其中的每个用户(id = 2)的总帖子。
而且我也尝试过:
Posts_count_per_user = User.posts.annotate(posts_count=Count('posts'))
User_Score_of_posts = Posts_count_per_user.aggregate(posts_score=Count('posts_count') * 1000)
但我收到此错误:
'ReverseManyToOneDescriptor'对象没有属性'annotate'
任何建议请...
谢谢,
您尝试过这个吗,
user_qs = User.objects.annotate(posts_count=Count('posts'))
# usage
for user_instance in user_qs:
print("post count: ", user_instance.posts_count)
print("post score: ", user_instance.posts_count * 1000)