Question

我想在自定义清理方法中验证许多字段。

到目前为止，我有这个：

class ProjectInfoForm(forms.Form):
    module = forms.ModelChoiceField(
        queryset=Module.objects.all(),
    )
    piece = forms.CharField(
        widget=forms.Select(),
        required=False,
    )
    span = forms.IntegerField(
        max_value=100,
        initial=48
    )
    max_span = forms.IntegerField(
        max_value=100,
        initial=0
    )


    def clean(self):
        span = self.cleaned_data['span']
        max_span = self.cleaned_data['max_span']
        piece = self.cleaned_data.['piece']

        # validate piece 
        try:
            Piece.objects.get(pk=m)
        except Piece.DoesNotExist:
            raise forms.ValidationError(
                'Illegal Piece selected!'
            )
            self._errors["piece"] = "Please enter a valid model"

        # validate spans
        if span > max_span:
            raise forms.ValidationError(
                'Span must be less than or equal to Maximum Span'
            )
            self._errors["span"] = "Please enter a valid span"
        return self.cleaned_data

但是，如果两个子句都无效，这只会给我一条消息。如何获取所有无效消息。此外，我没有获得特定于字段的消息 - 如何包含要为特定字段显示的消息？

任何帮助都非常感激。

Answer 1

存储错误，直到方法结束时才提高错误：

def clean(self):
    span = self.cleaned_data['span']
    max_span = self.cleaned_data['max_span']
    piece = self.cleaned_data.['piece']
    error_messages = []

    # validate piece 
    try:
        Piece.objects.get(pk=m)
    except Piece.DoesNotExist:
        error_messages.append('Illegal Piece selected')
        self._errors["piece"] = "Please enter a valid model"

    # validate spans
    if span > max_span:
        error_messages.append('Span must be less than or equal to Maximum Span')
        self._errors["span"] = "Please enter a valid span"

    if len(error_messages):
        raise forms.ValidationError(' & '.join(error_messages))

    return self.cleaned_data

Answer 2

在这种情况下，您应该编写自定义clean_FIELDNAME方法。这样，在模板中使用{{form.errors}}时，以后可以显示以字段为中心的验证错误。 clean 方法o.t.h.用于验证跨越多个字段的逻辑。看看我上面发布的链接，你需要知道的有关验证django表单的所有内容。

Answer 3

这是因为您使用的是raise。尝试用代码中的这两行替换它：

del self.cleaned_data['piece']

和

del self.cleaned_data['span']

Answer 4

看来这在Django的更高版本中已更改（似乎在2.1及更高版本中有效）：


from django import forms

class ContactForm(forms.Form):
    # Everything as before.
    ...

    def clean(self):
        cleaned_data = super().clean()
        cc_myself = cleaned_data.get("cc_myself")
        subject = cleaned_data.get("subject")

        if cc_myself and subject and "help" not in subject:
            msg = "Must put 'help' in subject when cc'ing yourself."
            self.add_error('cc_myself', msg)
            self.add_error('subject', msg)

https://docs.djangoproject.com/en/dev/ref/forms/validation/#raising-multiple-errors有更多详细信息。

Django自定义多个字段的验证

4 个答案: