Question

*任何时候我插入数据都会发生上述错误！ *

# my views 
def new_topic(request):
"""Add a new topic."""

if request.method != 'POST':
    # No data submitted; create a blank form.
    form = TopicForm()
else:
    # POST data submitted; process data.
    form = TopicForm(request.POST or None, request.FILES or None)
    if form.is_valid():

        new_topic = form.save(commit=False)
        new_topic.owner = request.user #this where i think, i'm messing up!
        new_topic.save()

        return HttpResponseRedirect(reverse('learning_logs:topics'))
context = {'form': form}
return render(request, 'learning_logs/new_topic.html', context)

*代表每个主题的模型* 来自django.contrib.auth.models导入用户

def upload_location(instance, filename):
    return "%s/%s" %(instance.id, filename)

class Topic(models.Model):
       """A topic the user is learning about"""
       text = models.CharField(max_length=200)
       date_added = models.DateTimeField(auto_now_add=True)
       image = models.ImageField()
       height_field = models.IntegerField(default=0)
       width_field = models.IntegerField(default=0)

       owner = models.ForeignKey(User)

       def __str__(self):
            """Return a string representation of the model."""
            return self.text

请帮忙！

Answer 1

如果用户已登录，则设置new_topic.owner = request.user应该没问题。但是，如果用户未登录，则尝试分配匿名用户会导致问题。

您可以使用login_required装饰器来阻止此操作，以便只有登录用户才能访问该视图。

@login_required
def new_topic(request):
    ...

/ new_topic上的ValueError /无法分配“<simplelazyobject：<django ...... =”“>”：“Topic.owner”必须是“用户”实例

1 个答案: