Question

我想获取信息：如果请求用户对此项目进行投票。

我的项目班级：

class Project(TimestampedModel):
    title = models.CharField(max_length=120)
    description = models.TextField()
    company = models.ForeignKey(
        Company, on_delete=models.CASCADE
    )
    tags = models.ManyToManyField(Tag)
    votes = models.ManyToManyField(User)

我的查询，我尝试通过内部注释和过滤来获取它，但不起作用

  queryset = Project.objects.all()
        if 'title' in filters.keys() and filters['title'] is not None:
            queryset = queryset.filter(title__icontains=filters['title'])
        queryset = queryset.annotate(num_votes=Count("votes"))
        queryset = queryset.annotate(user_vote=Count("votes__user_id", filter=Q(votes__user_id=filters['user_id'])))
        queryset = queryset.order_by('-created_at')

Answer 1

我解决了这个问题。

queryset = queryset.annotate（user_vote = Count（“ votes__user_id”，filter = Q（votes__id = filters ['user_id']）））

在这种关系中，我不知道voice__id等同于用户ID

Answer 2

尝试在投票字段中使用相关名称：

votes = models.ManyToManyField(User, related_name='projects') 这样，您可以访问用户为此related_name

投票的所有项目

user = User.objects.filter(username='john')
user.projects.all() # > all projects that user voted for

如何获取对象以及多对多对象信息

2 个答案: