附加到 Django 表单验证错误？

Question

我在 Django 1.6 中使用了自定义验证错误，它运行良好；但是，我一次只能显示一个错误。如果“if”语句中的条件失败，我该如何显示所有错误？

forms.py

class BaseNameFormSet (BaseFormSet):
...
...
...
if (firstname in firstnames) or (lastname in lastnames):
    raise forms.ValidationError ('First or last name must be unique')
if (firstname == '') or (lastname == ''):
    raise forms.ValidationError ('Both first and last name must be filled out')

addname.html

...
...
...
    {% if formset.non_form_errors %}
        <b>Please correct the error below:</b>
        <ul>
            {% for error in formset.non_form_errors %}
            <li><p style="color: red;"> {{ error }} </p></li>
        {% endfor %}
        </ul>

Answer 1

您可以声明一个填充了错误的变量，然后在最后显示一次。

class BaseNameFormSet (BaseFormSet):
    ...
    ...
    ...

    if (firstname in firstnames) or (lastname in lastnames):
         error_msg='First or last name must be unique'
    if (firstname == '') or (lastname == ''):
        error_msg+='<br>Both first and last name must be filled out'
    if error_msg:
        raise forms.ValidationError(error_msg)

Answer 2

如果您能够升级到 Django 1.7，您可以通过将列表传递给 ValidationError 构造函数来raise multiple errors。

errors = []
if (firstname in firstnames) or (lastname in lastnames):
    errors.append('First or last name must be unique')
if (firstname == '') or (lastname == ''):
    errors.append('Both first and last name must be filled out')
if errors:
    raise ValidationError(errors)

请注意，您通常不必进行if firstname == '' 之类的检查，只需将firstname 设为必填字段即可。您可能会发现 this question 关于在需要有用的表单集中制作表单。