Question

我正在尝试验证数据库中是否已存在提交的URL。

Form类的相关部分如下所示：

from django.contrib.sites.models import Site
class SignUpForm(forms.Form):
    # ... Other fields ...
    url = forms.URLField(label='URL for new site, eg: example.com')

    def clean_url(self):
        url = self.cleaned_data['url']
        try:
            a = Site.objects.get(domain=url)

        except Site.DoesNotExist:
            return url

        else:
            raise forms.ValidationError("That URL is already in the database.  Please submit a unique URL.")

    def clean(self):
        # Other form cleaning stuff.  I don't *think* this is causing the grief

问题是，无论我提交什么价值，我都无法提出ValidationError。如果我在clean_url()方法中执行类似的操作：

if Site.objects.get(domain=url):
    raise forms.ValidationError("That URL is already in the database.  Please submit a unique URL.")

然后我收到DoesNotExist错误，即使对于数据库中已存在的URL也是如此。有什么想法吗？

Answer 1

IRC的django频道救了我。问题是URLField.clean（）做了两件我没想到的事情：

如果不存在URL方案（例如，http：//），则该方法将“http：//”添加到网址
该方法还附加一个斜杠。

返回结果并存储在表单的cleaning_data中。所以我正在检查cleaned_data['url']期待类似example.com的内容并实际获得http://example.com/。可以说，将我的clean_url()方法更改为以下作品：

def clean_url(self):
        url = self.cleaned_data['url']        
        bits = urlparse(url)
        dom = bits[1]
        try:
            site=Site.objects.get(domain__iexact=dom)
        except Site.DoesNotExist:
            return dom
        raise forms.ValidationError(u'That domain is already taken.  Please choose another')

Answer 2

我是这样做的。它稍微简单一些。

try:
    a = Site.objects.get(domain=url)
    raise forms.ValidationError("That URL is already in the database.  Please submit a unique URL.")
except Site.DoesNotExist:
    pass
return url

Answer 3

我认为，您可以返回''并填写_errors。

msg = u"That URL is already in the database.  Please submit a unique URL."
self._errors["url"]=ErrorList([msg])
return ''

或

from django.contrib.sites.models import Site
class SignUpForm(forms.Form):
    # ... Other fields ...

url = forms.URLField(label='URL for new site, eg: example.com')

def clean_url(self):
    url = self.cleaned_data['url']
    try:
        a = Site.objects.get(domain=url)
        raise forms.ValidationError("That URL is already in the database.  Please submit a unique URL.")
    except Site.DoesNotExist:
        return url
    return ''

def clean(self):
    # Other form cleaning stuff.  I don't *think* this is causing the grief

Answer 4

我登录的原因是因为我在Google上发现了类似的问题并希望在Carl Meyers帖子中添加评论，并指出使用self._errors完全有效，因为Django文档：

http://docs.djangoproject.com/en/1.2/ref/forms/validation/#cleaning-and-validating-fields-that-depend-on-each-other

在Django表单上引发ValidationError的问题

4 个答案: