On Tue, 2008-12-09 at 19:23 -0800, DragonSlayre wrote:
> Hi,
>
> I've just made a new 'Student' model, and was trying to create a new
> Student in the admin interface, and I got the following error:
>
> Environment:
>
> Request Method: POST
> Request URL: http://localhost:8000/admin/student/student/add/
> Django Version: 1.0.2 final
> Python Version: 2.5.2
> Installed Applications:
> ['django.contrib.auth',
> 'django.contrib.contenttypes',
> 'django.contrib.sessions',
> 'django.contrib.sites',
> 'django.contrib.admin',
> 'mysite.student']
> Installed Middleware:
> ('django.middleware.common.CommonMiddleware',
> 'django.contrib.sessions.middleware.SessionMiddleware',
> 'django.contrib.auth.middleware.AuthenticationMiddleware')
>
>
> Traceback:
> File "/usr/lib/python2.5/site-packages/django/core/handlers/base.py"
> in get_response
> 86. response = callback(request, *callback_args,
> **callback_kwargs)
> File "/usr/lib/python2.5/site-packages/django/contrib/admin/sites.py"
> in root
> 157. return self.model_page(request, *url.split('/',
> 2))
> File "/usr/lib/python2.5/site-packages/django/views/decorators/
> cache.py" in _wrapped_view_func
> 44. response = view_func(request, *args, **kwargs)
> File "/usr/lib/python2.5/site-packages/django/contrib/admin/sites.py"
> in model_page
> 176. return admin_obj(request, rest_of_url)
> File "/usr/lib/python2.5/site-packages/django/contrib/admin/
> options.py" in __call__
> 191. return self.add_view(request)
> File "/usr/lib/python2.5/site-packages/django/db/transaction.py" in
> _commit_on_success
> 238. res = func(*args, **kw)
> File "/usr/lib/python2.5/site-packages/django/contrib/admin/
> options.py" in add_view
> 499. self.log_addition(request, new_object)
> File "/usr/lib/python2.5/site-packages/django/contrib/admin/
> options.py" in log_addition
> 294. object_repr = force_unicode(object),
> File "/usr/lib/python2.5/site-packages/django/utils/encoding.py" in
> force_unicode
> 49. s = unicode(s)
>
> Exception Type: TypeError at /admin/student/student/add/
> Exception Value: coercing to Unicode: need string or buffer, tuple
> found
>
>
>
>
> My model looks like this:
> class Student(models.Model):
[...]
> def __unicode__(self):
> return self.user.username, ", ", self.user.first_name, " ",
> self.user.last_name
You are returning a tuple here and you must return a unicode object. If
you want to concatenate strings, do it with "+", or use format markers
like so:
return u"%s, %s %s" % (self.user.username, self.user.first_name,
self.user.last_name)
Using commas to separate objects, even without the surrounding
parentheses, is how you specify a tuple in Python.
Regards,
Malcolm
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