Postgres can't truncate the nickname if it's more than 30 characters

[Adnane Belmadiaf]

If someone with a nickname (>30) tries to connect Postgres will throw an error :

Traceback (most recent call last):

  File "/usr/lib/pymodules/python2.6/django/core/handlers/base.py", line 92, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File "/usr/lib/pymodules/python2.6/django/contrib/csrf/middleware.py", line 135, in wrapped_view
    resp = view_func(*args, **kwargs)

  File "/usr/lib/pymodules/python2.6/django/contrib/csrf/middleware.py", line 148, in wrapped_view
    return view_func(*args, **kwargs)

  File "/usr/lib/python2.6/dist-packages/django_openid_auth/views.py", line 267, in login_complete
    user = authenticate(openid_response=openid_response)

  File "/usr/lib/pymodules/python2.6/django/contrib/auth/__init__.py", line 37, in authenticate
    user = backend.authenticate(**credentials)

  File "/usr/lib/python2.6/dist-packages/django_openid_auth/auth.py", line 77, in authenticate
    user = self.create_user_from_openid(openid_response)

  File "/usr/lib/python2.6/dist-packages/django_openid_auth/auth.py", line 233, in create_user_from_openid
    user = User.objects.create_user(username, email, password=None)

  File "/usr/lib/pymodules/python2.6/django/contrib/auth/models.py", line 105, in create_user
    user.save()

  File "/usr/lib/pymodules/python2.6/django/db/models/base.py", line 410, in save
    self.save_base(force_insert=force_insert, force_update=force_update)

  File "/usr/lib/pymodules/python2.6/django/db/models/base.py", line 495, in save_base
    result = manager._insert(values, return_id=update_pk)

  File "/usr/lib/pymodules/python2.6/django/db/models/manager.py", line 177, in _insert
    return insert_query(self.model, values, **kwargs)

  File "/usr/lib/pymodules/python2.6/django/db/models/query.py", line 1087, in insert_query
    return query.execute_sql(return_id)

  File "/usr/lib/pymodules/python2.6/django/db/models/sql/subqueries.py", line 320, in execute_sql
    cursor = super(InsertQuery, self).execute_sql(None)

  File "/usr/lib/pymodules/python2.6/django/db/models/sql/query.py", line 2369, in execute_sql
    cursor.execute(sql, params)

DataError: value too long for type character varying(30)