Question

所以问题是我无法从表单中保存ManyToManyField。

forms.py

class addGoods(forms.Form):
   ...

    permission = form['permission'],

   ...

models.py

class Add_good(models.Model):
   ...

    permission = models.ManyToManyField(Permission, related_name="+")

   ...

views.py

if request.method == "POST":
    form = addGoods(request.POST)

    if form.is_valid():

        form = form.cleaned_data
        newGood = Add_good(permission = form['permission'])

我试图做这样的事情，但也有错误

views.py

if request.method == "POST":
        form = addGoods(request.POST)

        if form.is_valid():

            form = form.cleaned_data
            newGood = Add_good(permission = form['permission'])

            to_do_list = newGood.save(commit=False)
            for permis in form['permission']:
                to_do_list.permission.add(permis)
                to_do_list.save()
            newGood.save_m2m()

回溯：

Exception Type: TypeError at /goods/add
Exception Value: 'permission' is an invalid keyword argument for this function

Answer 1

问题在于： newGood = Add_good(permission = form['permission'])

权限是ManyToMany字段，因此您的表不直接具有permision字段，因此它不能接受该参数。您可以创建模型条目，然后添加权限：

newGood = Add_good.objects.create(...)
newGood.permission.add(Permissions.objects.get(...))

此外，您的表单不会像刚刚permission = form['permission']那样通过权限制作模型，因此您需要在视图中而不是/在for循环中进行手动查询。

无法保存ManyToManyField

1 个答案: