我正在 CS50w 中的一个项目中工作,我必须显示我关注的用户的帖子,但我收到以下错误
ValueError:无法将 QuerySet 用于“以下”:将 QuerySet 用于“用户”。
models.py:
class Post(models.Model):
"""Tracks all the posts"""
text = models.TextField(max_length=256)
user = models.ForeignKey(User, on_delete=models.CASCADE)
date_posted = models.DateTimeField(auto_now_add=True)
class Following(models.Model):
"""Tracks the following of a user"""
user = models.ForeignKey(User, on_delete=models.CASCADE)
following = models.ForeignKey(User, on_delete=models.CASCADE, related_name="followers")
这就是我尝试检索我关注的用户的帖子的方式: views.py
# Gets all the posts from the users the current user is following
followings_usernames = Following.objects.filter(user=request.user)
posts = Post.objects.filter(user=followings_usernames)
您可以通过
Following.user
字段通过反向关系 (followers
) 基于字段 (Post.user
) 进行过滤:
posts = Post.objects.filter(user__followers__user=request.user)
请参阅 Django 文档了解跨越关系的查找以及使用双下划线分隔模型和字段。
尝试使用这个,可能会有帮助
# Gets all the posts from the users the current user is following
followings_usernames = list(Following.objects.filter(user=request.user).values_list('user', flat=True))
posts = Post.objects.filter(user__in=followings_usernames)