coercing to Unicode: need string or buffer, tuple found

[DragonSlayre]

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:

from django.db import models
from django.contrib.auth.models import User

GENDER_CHOICES = (
        ('m', 'male'),
        ('f', 'female'),
    )


# Create your models here.
class Student(models.Model):

    # This is the only required field
    user = models.ForeignKey(User, unique=True)

    # Being nosey
    gender = models.CharField(max_length=1, choices=GENDER_CHOICES)
    birth_date = models.DateField()

    # Addressing details
    street_address = models.CharField(max_length=50, blank=False)
    suburb = models.CharField(max_length=20, blank=True)
    city = models.CharField(max_length=20, blank=False)
    post_code = models.PositiveSmallIntegerField(blank=False)

    # Contact details
    contact_phone = models.CharField(max_length=11, blank=False)
    cell_phone = models.CharField(max_length=11, blank=True)

    def __unicode__(self):
        return self.user.username, ", ", self.user.first_name, " ",
self.user.last_name


I'm quite new to Django, so aren't sure about what's going on at all.
I appreciate any help people can give,


Thanks!
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