概述
class ChangeNameForm(forms.ModelForm): username = forms.CharField(max_length=30) first_name = forms.CharField(max_length=255) last_name = forms.CharField(max_length=255) def clean_username(self): username = self.cleaned_data['username'] try: user = User.objects.get(username=username) except user.DoesNotExist: return username raise forms.ValidationError(u'Username "%s" is already in use.' % username)
谢谢.
form = ChangeNameForm(request.POST,instance=request.user)
如果是这样,您可以从表单方法访问记录的用户,您的验证方法可以是这样的:
def clean_username(self): username = self.cleaned_data['username'] try: user = User.objects.exclude(pk=self.instance.pk).get(username=username) except User.DoesNotExist: return username raise forms.ValidationError(u'Username "%s" is already in use.' % username)
考虑使用.exists方法,因为它会比您尝试使用.get方法检索所有用户信息更快地查询数据库.代码也有点清洁:
def clean_username(self): username = self.cleaned_data['username'] if User.objects.exclude(pk=self.instance.pk).filter(username=username).exists(): raise forms.ValidationError(u'Username "%s" is already in use.' % username) return username
或者,您也可以在提高ValidationError时关注these guidelines.
我现在无法测试这个代码,所以如果有什么问题,我们道歉.
总结
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