简单的ChoiceField错误

Question

我试图实现一件相当简单的事情，但被一个错误卡住了，并且不知道它来自哪里。

我想在我的视图中创建并保存一个对象。代码非常简单：

models.py：

class Iteration(models.Model):
user = models.ForeignKey(User)
one_two = '1-2 weeks'
two_four = '2-4 weeks'
four_six = '4-6 weeks'
six_eight = '6-8 weeks'
DURATION_CHOICES = (
    (one_two, '1-2 weeks'),
    (two_four, '2-4 weeks'),
    (four_six, '4-6 weeks'),
    (six_eight, '6-8 weeks'),
)

duration = models.CharField(max_length=100, choices=DURATION_CHOICES, default=two_four)
project = models.ForeignKey(Project)

def is_upperclass(self):
    return self.duration in (self.one_two, self.six_eight)

views.py：

def New_iteration(request, slug):
form = IterationForm()
user = request.user
project = Project.objects.get(user=user, slug=slug)
if request.method == 'POST':
    form = IterationForm(request.POST)
    errors = form.errors
    if form.is_valid:
        user = request.user
        duration = request.POST['duration']
        project = Project.objects.get(user=user, slug=slug)
        new_iteration = Iteration(user.id, form.cleaned_data['duration'], project.id)
        new_iteration.save()
        return HttpResponseRedirect("/dashboard/")
    else:
        return HttpResponse("not valid")
return render(request, "new_iteration.html", {"form" : form, "project" : project, "user" : user})

我收到一个错误invalid literal for int() with base 10: '2-4 weeks'。我想它来自于

new_iteration = Iteration(user.id, form.cleaned_data['duration'], project.id)

线路，但我不确定该怎么做。

Answer 1

您不应将对象创建为

new_iteration = Iteration(user.id, form.cleaned_data['duration'], project.id)

您需要将数据作为关键字参数作为

new_iteration = Iteration(user = user, duration = form.cleaned_data['duration'], 
                          project = project)

然而，我相信IterationForm是模型形式，你想在保存迭代之前获得project，更好的方法是

if form.is_valid(): #note this is function call
    user = request.user
    project = Project.objects.get(user=user, slug=slug)
    new_iteration = form.save(commit=False)
    new_iteration.project = project
    new_iteration.save()

Answer 2

我已经完成了任务。为了更好地理解，我应该添加我的forms.py。我已经编辑了我的forms.py文件，并在那里定义了唯一的“可选”字段应该是"duration"，并且当在视图中启动表单时，Django应该获得其他内容(用户和项目)。

另一个错误是我没有将数据作为关键字参数传递，谢谢Rohan。

因此，我已经将fields = ('duration',)添加到我的ModelForm中，并使用关键字参数重新初始化了表单。