Django form.is_valid持续抛出KeyError [英] Django form.is_valid keeps throwing KeyError

问题描述

我的视图中有这个代码：

  def add_intern（request）：
 if request.method = ='POST'：
 form = InternApplicationForm（request.POST）
如果form.is_valid（）：
 form.save（）
 form = InternApplicationForm（）
 
 form = InternApplicationForm（）
 
返回render_to_response（'application.html'，{'form'：form}，
 context_instance = RequestContext（request））
  

表单是一个 ModelForm ，底层模型包含一个 IntegerField 。

当我发布一个带有空值的表单时，验证信息显示得很好。

当我发布非整数值的表单时，我得到这个：

$ / $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ that that that that that that that that that that that that that that that that that that that that that that that that that that that that that that that that该代码似乎在 is_valid（）调用中崩溃，我认为它是安全的（即应该返回 False 如果有问题而不仅仅是崩溃）。如何解决这个问题？

StackTrace

  Django版本：1.3 
 Python版本：2.6.5 
 
文件/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/core/handlers /base.pyin get_response 
 111. response = callback（request，* callback_args，** callback_kwargs）
文件/home/dan/www/ints/backend/views.pyin add_intern 
 14.如果form.is_valid（）：
文件/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/forms/forms.py in is_valid 
 121. return self.is_bound而不是bool（self.errors）
文件/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6。 egg / django / forms / forms.py在_get_errors 
 112. self.full_clean（）
文件/usr/local/lib/python2.6/dist-packages/Django-1.3-py2。 6.egg / django / forms / forms.pyin full_clean 
 267. self._clean_fields（）
文件/usr/local/lib/python2.6/dist-packages/Django-1.3- py2.6.egg / django的/ F orms / forms.pyin _clean_fields 
 284. value = field.clean（value）
文件/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6 .egg / django / forms / fields.pyin clean 
 169. value = self.to_python（value）
文件/usr/local/lib/python2.6/dist-packages/Django- in-python 
 248. raise ValidationError（self.error_messages ['invalid']）
 
异常类型：KeyError at / 
异常值：'invalid'
  

解决方案

，所以我只是把它钉住了。

我遵循设置我的自定义错误消息进行验证。

所以我有这个代码：

  def __init __（self，* args，** kwargs）：
 super（InternApplicationForm，self）.__ init __（* args，** kwargs） 
 for field in self.fields.values（）：
 field.error_messages = {'required'：'*'} 
  

为所有字段设置相同的必填字段验证消息。

当错误不同（ invalid 为非整数），Django查看我提供的字典，并猜测什么， KeyError 。因为没有无效的消息那里（这是我的错）。

所以修复是

  field.error_messages = {'required'：'*'，'invalid'：这不是一个数字，先生。 $ b  

（可能其他错误信息键）

I have this code in my view:

def add_intern(request):
    if request.method == 'POST':
        form = InternApplicationForm(request.POST)
        if form.is_valid():
            form.save()
            form = InternApplicationForm()
    else:
        form = InternApplicationForm()

    return render_to_response('application.html', {'form': form},
                              context_instance = RequestContext(request))

The form is a ModelForm, and the underlying model contains an IntegerField.
When I post a form with empty value, the validation message is displayed just fine.

When I post the form with a non-integer value, I get this:

KeyError at /

'invalid'

It kind of surprises me that the code seems to crash on is_valid() call, which I assumed is safe (i.e. should return False if there is a problem and not just crash). How do I fix this?

Stacktrace

Django Version: 1.3
Python Version: 2.6.5

File "/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/home/dan/www/ints/backend/views.py" in add_intern
  14.         if form.is_valid():
File "/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/forms/forms.py" in is_valid
  121.         return self.is_bound and not bool(self.errors)
File "/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/forms/forms.py" in _get_errors
  112.             self.full_clean()
File "/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/forms/forms.py" in full_clean
  267.         self._clean_fields()
File "/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/forms/forms.py" in _clean_fields
  284.                     value = field.clean(value)
File "/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/forms/fields.py" in clean
  169.         value = self.to_python(value)
File "/usr/local/lib/python2.6/dist-packages/Django-1.3-py2.6.egg/django/forms/fields.py" in to_python
  248.             raise ValidationError(self.error_messages['invalid'])

Exception Type: KeyError at /
Exception Value: 'invalid'

解决方案

Okay, so I just nailed it down.

I followed this advice to set my custom error message for validation.
So I had this code:

def __init__(self, *args, **kwargs):
    super(InternApplicationForm, self).__init__(*args, **kwargs)
    for field in self.fields.values():
        field.error_messages = {'required':'*'}

that set the same required field validation message for all fields.

When the error was different (invalid for non-integer), Django looked in the dictionary I supplied—and guess what, KeyError. Because there is no message for invalid there (and that's my fault).

So the fix is

        field.error_messages = {'required': '*', 'invalid': "That's not a number, sir."}

(and possibly other error message keys)

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