Question

我一直收到此错误＆＃39;发布＆＃39;对象没有属性＆＃39; likes_by_set＆＃39;

Models.py 
liked_by = models.ManyToManyField(User, related_name='likedby')

views.py 

def like_unlike_article(request, post_id):
    a = post.objects.get(id=post_id) 
    user = request.user

    if user is a.liked_by_set.all():
        # User has liked it before, means he wants to unlike it
        a.liked_by_set.remove(user) # remove him from ``liked_by`` set
        a.likes -= 1 # unlike the article
    else:
        # User wants to like it
        a.liked_by_set.add(user) # add him to ``liked_by`` set
        a.likes += 1 # like the article

    a.save()

任何帮助？

Answer 1

您应该使用'likes_by'而不是'likes_by_set'：

a.liked_by.all()

另请注意，user is a.liked_by_set.all()将始终返回False。使用in子句：

if user in a.liked_by.all():
    ...

Answer 2

有多种方法可以解决这个问题。

class Post:
    liked_by = models.ManyToManyField(User, related_name='likedby')

这将使以下可能

a = post.objects.get(id=post_id)
a.liked_by.all() # [<User: 1>, <User: 2>] 

or

user = request.user
user.liked_by_set.all() # [<Post: 1>, <Post: 2>]

我会创建以下语句

if a.liked_by.get(id=user.id):
    ...
else:
    ...

或

if user.liked_by_set.get(id=post_id):
    ...
else:
    ...

继续收到此错误'post'对象没有属性'likes_by_set'

2 个答案: