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我在我的django應用程序中具有以下表單。我重寫了構造函數,以便限制顯示在「類」字段中的選項,以便只顯示學生註冊的類。無法指定 - 必須是實例
#forms.py
class TestForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
self.user = kwargs.pop('user', None)
super(TestForm, self).__init__(*args, **kwargs)
classes = [Classes.objects.filter(students__username=self.user.username)]
class_list = list()
for c in classes:
for single_class in c:
cl = Classes.objects.get(id=single_class.id)
class_list.append([cl, single_class])
self.fields['classes'] = forms.ChoiceField(choices=class_list)
class Meta:
model = Test
fields = ('classes', 'name')
但是,這樣做給了我一個無法分配「Class1234:測試類」 - 「Test.classes」必須是一個「類」的實例。當我打印class_list,我得到這個:
[[<Classes: Class1234: Test class>, <Classes: Class1234: Test class>],[<Classes: Testing: 2nd class>, <Classes: Testing: 2nd class>],[<Classes: 3rd: Class>, <Classes: 3rd: Class>]]
對我來說,這看起來像實際的類的對象,所以我不明白爲什麼這是行不通的。作爲參考,這裏是我的模型和視圖:
#models.py
class UserProfile(models.Model):
user = models.OneToOneField(User)
teacher = models.BooleanField(default=False)
def __str__(self):
return "{0} {1}".format(self.user.first_name, self.user.last_name)
class Classes(models.Model):
classcode = models.CharField(max_length=15)
classname = models.TextField()
students = models.ManyToManyField(User)
def __str__(self):
return "{0}: {1}".format(self.classcode, self.classname)
class Test(models.Model):
classes = models.ForeignKey(Classes, on_delete=models.CASCADE)
name = models.TextField(max_length=100)
points = models.ManyToManyField(User, default=0)
def __str__(self):
return "{0}".format(self.name)
#views.py
def add_test(request):
added = False
form = TestForm(user=request.user)
if request.method == "POST":
form = TestForm(request.POST, user=request.user)
if form.is_valid():
form.save()
added = True
return render(request, 'site/addtest.html', {'form': form, 'added': added})
感謝您的幫助 - 正是我一直在尋找的東西 – user2151557