python - get_or_create 抛出完整性错误

Question

鉴于 object.get_or_create() 的全部意义在于获取对象(如果它已经存在)，我不明白为什么它会抛出此代码的完整性错误:

class UserAdd(TemplateView):

def post(self, request, *args, **kwargs):
    context = self.get_context_data(*args, **kwargs)
    form = UserAddForm(request.POST)
    if form.is_valid():
        first_name = form.cleaned_data['first_name']
        last_name = form.cleaned_data['last_name']
        myemail = form.cleaned_data['email']
        mypass = form.cleaned_data['password']
        if myemail and mypass:
            myuser,created = User.objects.get_or_create(email=myemail, username=myemail, first_name=first_name, last_name=last_name)
            if created:
                myuser.set_password(mypass)
    return HttpResponseRedirect('/')

这是错误:

django.db.utils.IntegrityError IntegrityError: (1062, "Duplicate entry 'user@domain.com' for key 'username_UNIQUE'")

有人知道怎么回事吗？

Answer 1

发送到 get_or_create 方法的参数需要完全匹配，否则 django 的 ORM 会尝试创建一个新对象，并且由于会违反主键/唯一列约束，因此您将获得错误。

试试这个:

if form.is_valid():
    first_name = form.cleaned_data['first_name']
    last_name = form.cleaned_data['last_name']
    myemail = form.cleaned_data['email']
    mypass = form.cleaned_data['password']
    if myemail and mypass:
        myuser,created = User.objects.get_or_create(email=myemail, defaults = {'username': myemail, 'first_name': first_name, 'last_name': last_name})
        if created:
            myuser.set_password(mypass)

return HttpResponseRedirect('/')

阅读更多关于 get_or_create here . defaults= 参数是您所需要的。