我正在尝试做的是允许经过身份验证的用户为文章提供赞。
models.py:
class NewsItem(models.Model):
heading = models.CharField(max_length=550, blank = False)
news_body = models.TextField(blank = True)
...
likes = models.ManyToManyField(User, blank = True)
views.py:
def newsitem_slug(request, newsitem_id, slug):
newsitem = get_object_or_404(NewsItem, pk=newsitem_id, active = 1)
...
# Processing Likes:
if request.method == 'POST' and request.POST.get('newsitem_like'):
form = LikesForm(request.POST, instance=newsitem)
if form.is_valid():
user = User(id=request.user.id)
if user not in newsitem.likes.all():
newsitem.likes.add(user)
else:
newsitem.likes.remove(user)
...
forms.py:
class LikesForm(ModelForm):
class Meta:
model = NewsItem
fields = ['likes',]
添加喜欢时出现错误:
Cannot add "<User: >": instance is on database "default", value is on database "None"
[建议在使用add
方法之前先保存用户和文章,但是在我看来,这似乎不起作用。
该怎么办?
您正在创建User
对象,如果要这样做,请在使用前保存它。如果要通过ID获取User
对象,请使用模型管理器.get(pk=request.user.id)
来获取它。