Django，保存ModelForm

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Django，保存ModelForm

我创建了一个名为Student的模型，它继承自Django User并作为另一个模型的外键，同时它还有一个名为year的整数字段。我尝试保存一个表单，它有两个字段。一个是课程ID，另一个是整数字段year。当我点击提交时，出现错误：无法分配"u'2'"："Student.course"必须是"Course"的实例。

models.py

class Student(models.Model):
    user = models.OneToOneField(User)
    course = models.ForeignKey(Course)
    year = models.IntegerField(validators=[MinValueValidator(1),
                                           MaxValueValidator(7)])

view.py

def step3(request):
    user = request.user
    if request.method == 'POST':
        form = SelectCourseYear(request.POST)
        if form.is_valid():
            form.save()
            return render_to_response("registration/complete.html", RequestContext(request))
    else:
        form = SelectCourseYear()
    return render(request, 'registration/step3.html')

forms.py

class SelectCourseYear(forms.ModelForm):
    course = forms.CharField()
    year = forms.IntegerField(required=True)
    class Meta:
        model = Student
        fields = ['user', 'course', 'year']

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