get_or_create抛出完整性错误

Question

鉴于object.get_or_create()的重点是获取对象(如果它已经存在),我无法理解为什么它会为此代码抛出完整性错误:

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'")

有谁知道发生了什么？

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,并且由于违反了主键/唯一列约束,您将收到错误.

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('/')

在get_or_create这里阅读更多内容.这个defaults=论点就是你所需要的.