form.cleaned_data是表单处理时

Question

这是一个非常简单的形式，但我不知道哪里出错了。当我检查django站点的调试模式时，我发现new字段的clean_data丢失了，如下图所示：

class PasswordEditForm(forms.Form):
  old = forms.CharField(widget=forms.PasswordInput, min_length=6,
                      max_length=30, label='舊密碼', label_suffix=' ')
  new = forms.CharField(widget=forms.PasswordInput, min_length=6,
                      max_length=30,  label='新密碼', label_suffix=' ')
  new_confirm = forms.CharField(widget=forms.PasswordInput, min_length=6,
                              max_length=30,  label='再輸入一次', label_suffix=' ')

  def clean_new(self):
    cd = self.cleaned_data
    if cd['old'] == cd['new']:
      raise forms.ValidationError('新密碼與舊密碼相同')
    return cd['new']

  def clean_new_confirm(self):
    cd = self.cleaned_data
    if cd['new'] != cd['new_confirm']:
      raise forms.ValidationError('兩次輸入密碼不相符')
    return cd['new_confirm']

Answer 1

问题是如果您键入相同的新旧密码，则clean_new方法引发异常并且不返回任何值。这就是为什么在clean_new_confirm之后执行的clean_new cleaning_data不包含new值。

只需使用get即可避免错误。首先检查cleaning_data是否包含new值，如果是，请检查new是否等于new_confirm：

def clean_new_confirm(self):
    cd = self.cleaned_data
    new_pass = cd.get('new')
    if new_pass and new_pass != cd.get('new_confirm'):
        raise forms.ValidationError('兩次輸入密碼不相符')
    return cd['new_confirm']