On Tue, Mar 15, 2011 at 2:36 PM, Ben Dembroski <i...@ionraystudios.com> wrote:
> Hi Tom,
>
> Thanks for your reply. (You're right, my example was lousy).
>
> I did in fact try what you suggested earlier on, and got the the
> following error:
>
> AttributeError at /people/add/
>
> 'ValidationError' object has no attribute 'message_dict'
>
> Request Method: POST
> Request URL: http://localhost:8000/people/add/
> Django Version: 1.3 rc 1 SVN-15755
> Exception Type: AttributeError
> Exception Value:
>
> 'ValidationError' object has no attribute 'message_dict'
>
> Exception Location: /home/benjamin/Ion/ellieharrison/trajectories/
> views.py in playeradd, line 298
> Python Executable: /usr/bin/python
> Python Version: 2.6.6
> Python Path:
>
> ['/home/benjamin/Ion/ellieharrison',
> '/usr/lib/python2.6',
> '/usr/lib/python2.6/plat-linux2',
> '/usr/lib/python2.6/lib-tk',
> '/usr/lib/python2.6/lib-old',
> '/usr/lib/python2.6/lib-dynload',
> '/usr/lib/python2.6/dist-packages',
> '/usr/lib/python2.6/dist-packages/PIL',
> '/home/benjamin/django-trunk',
> '/usr/lib/python2.6/dist-packages/gst-0.10',
> '/usr/lib/pymodules/python2.6',
> '/usr/lib/python2.6/dist-packages/gtk-2.0',
> '/usr/lib/pymodules/python2.6/gtk-2.0']
>
> Server time: Tue, 15 Mar 2011 14:27:13 +0000
>
> I have this in the code:
> from django.core.exceptions import ValidationError, NON_FIELD_ERRORS
>
> and the code is currently so:
> except ValidationError, e:
> errormsg = e.message_dict[NON_FIELD_ERRORS]
>
> form = EditPerson()
> return render_to_response('personentry.html',
> { 'form' : form,
> 'errormsg': errormsg },context_instance=RequestContext(request))
>
>
> Here's the full traceback:
>
> Environment:
>
>
> Request Method: POST
> Request URL: http://localhost:8000/people/add/
>
> Django Version: 1.3 rc 1 SVN-15755
> Python Version: 2.6.6
> Installed Applications:
> ['django.contrib.auth',
> 'django.contrib.contenttypes',
> 'django.contrib.sessions',
> 'django.contrib.sites',
> 'django.contrib.messages',
> 'django.contrib.admin',
> 'trajectories']
> Installed Middleware:
> ('django.middleware.common.CommonMiddleware',
> 'django.contrib.sessions.middleware.SessionMiddleware',
> 'django.middleware.csrf.CsrfViewMiddleware',
> 'django.contrib.auth.middleware.AuthenticationMiddleware',
> 'django.contrib.messages.middleware.MessageMiddleware')
>
>
> Traceback:
> File "/home/benjamin/django-trunk/django/core/handlers/base.py" in
> get_response
> 111. response = callback(request,
> *callback_args, **callback_kwargs)
> File "/home/benjamin/django-trunk/django/contrib/auth/decorators.py"
> in _wrapped_view
> 23. return view_func(request, *args, **kwargs)
> File "/home/benjamin/Ion/ellieharrison/trajectories/views.py" in
> playeradd
> 298. errormsg = e.message_dict[NON_FIELD_ERRORS]
>
> Exception Type: AttributeError at /people/add/
> Exception Value: 'ValidationError' object has no attribute
> 'message_dict'
>
Hmm, I think the docs are, if not wrong, misleading. From looking at
the code (1.2/trunk), ValidationError only has an attribute
message_dict if it is constructed with a dictionary (I let out an
audible 'ewww' as I read the code).
If it is constructed with a string or a list of strings, then it
should have an attribute messages, which is a simple list of strings.
There is also a method update_error_dict(). I think using this, you
can write some code which works in all cases:
from django.core.exceptions import ValidationError, NON_FIELD_ERRORS
try:
...
except ValidationError, e:
message_dict = e.update_error_dict({})
print message_dict[NON_FIELD_ERRORS]
Just while I'm on this class, the update_error_dict() method will
happily take None as an argument if it is constructed with a
dictionary (by design, it checks for it), but blows up if it is
constructed with a list or a string:
>>> e=ValidationError({'foo': 'bar'})
>>> e.update_error_dict(None)
{'foo': 'bar'}
>>> e=ValidationError('foo bar')
>>> e.update_error_dict(None)
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "django/core/exceptions.py", line 85, in update_error_dict
error_dict[NON_FIELD_ERRORS] = self.messages
TypeError: 'NoneType' object does not support item assignment
This class is horrendous - however it is constructed, it should
present a consistent interface. It can't even present a consistent
method.
Dirty, Bad and Wrong.
Cheers
Tom
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