django - 如何在没有 HTML 标记的情况下提取 Django 表单错误消息

Question

我需要提取消息和字段。

例如，我有这个 django 表单错误结果

<ul class="errorlist">
   <li>__all__
     <ul class="errorlist nonfield">
        <li>Pointofsale with this Official receipt and Company already exists.</li>
     </ul>
   </li>
</ul>

从这段代码的输出

def post_sale(request):
    sale_form = request["data"]

    if sale_form.is_valid():
       save_form.save()
    else:
       print save_form.errors

但我需要实现的是在没有标签的情况下获取消息，所以我可以以纯字符串/文本的形式返回这些消息。

def post_sale(request):
    sale_form = request["data"]

    if sale_form.is_valid():
       save_form.save()
    else:
       # This is just pseudo code
       for field in save_form.errors:
           field = str(field["field"})
           message = str(field["error_message"])

           print "Sale Error Detail"
           print field
           print message

           error_message = { 'field':field,'message':message }
           error_messages.append(error_message )

输出将是:

Sale Error Detail
(the field where form error exists)
Pointofsale with this Official receipt and Company already exists.

探索的问题和文档

displaying django form error messages instead of just the field name

Getting a list of errors in a Django form

django form errors. get the error without any html tags

How do I display the Django '__all__' form errors in the template?

https://docs.djangoproject.com/en/1.10/ref/forms/api/

https://docs.djangoproject.com/en/1.10/topics/forms/

谢谢，请告诉我是否有问题或需要澄清，以便我修复它。

Answer 1

errors绑定(bind)表单的属性将包含该表单引发的所有错误，作为字典。键是字段或其他特殊值(如 __all__ )，值是一个或多个错误的列表。

这是一个关于它如何工作的简单示例:

>>> from django import forms
>>> class MyForm(forms.Form):
...     name = forms.CharField()
...     email = forms.EmailField()
...     
>>> f = MyForm() # Note, this is an unbound form
>>> f.is_valid()
False
>>> f.errors # No errors
{}
>>> f = MyForm({}) # Now, the form is bound (to an empty dictionary)
>>> f.is_valid()
False
>>> f.errors # dictionary of errors
{'name': [u'This field is required.'], 'email': [u'This field is required.']}

在您看来，根据您的需要，您可以返回 form.errors 的值。 ，或将其解析为您需要的任何结构。

for field, errors in form.errors.items():
   print('Field: {} Errors: {}'.format(field, ','.join(errors))

对于您提到的特定错误，这是由于覆盖 clean() 而引发的自定义错误。方法 - 这就是为什么它被列在特殊标识符 __all__ 下的原因而不是在特定领域。

这在 forms reference, under validation 中有所提及:

Note that any errors raised by your Form.clean() override will not be associated with any field in particular. They go into a special “field” (called __all__), which you can access via the non_field_errors() method if you need to. If you want to attach errors to a specific field in the form, you need to call add_error().