title: Django - Always receiving __init__() takes exactly 2 arguments (5 given) when trying to store oauth2 credentials in db
body: <p>I've been trying to save credentials after a user uses their youtube account to authenticate their account.  I've been following this example to store my new created credentials in my database for later use.  <a href="https://code.google.com/p/google-api-python-client/source/browse/samples/django_sample/" rel="nofollow">https://code.google.com/p/google-api-python-client/source/browse/samples/django_sample/</a>.  In it we are supposed to create a credentials model for django like below.</p>
  
  <pre><code>from django.contrib.auth.models import User
  from django.db import models
  from oauth2client.django_orm import CredentialsField
  ...
  class CredentialsModel(models.Model):
  id = models.ForeignKey(User, primary_key=True)
  credential = CredentialsField()
  </code></pre>
  
  <p>I'm using South so I had to create a custom migration as it did not like the custom "CredentialsField" in my model.  I copies a user's migration from this repo <a href="https://github.com/ssutee/watna_location/blob/master/location/migrations/0010_auto__add_credentialsmodel.py#L19" rel="nofollow">https://github.com/ssutee/watna_location/blob/master/location/migrations/0010_auto__add_credentialsmodel.py#L19</a>, shown below.</p>
  
  <pre><code>def forwards(self, orm):
      # Adding model 'CredentialsModel'
      db.create_table('location_credentialsmodel', (
          ('id', self.gf('django.db.models.fields.related.ForeignKey')(to=orm['auth.User'], primary_key=True)),
          ('credential', self.gf('oauth2client.django_orm.CredentialsField')(null=True)),
      ))
      db.send_create_signal('location', ['CredentialsModel'])
  </code></pre>
  
  <p>Now every time I run my app, it crashes on</p>
  
  <pre><code>storage = Storage(CredentialsModel, 'id', user, 'credential')
  </code></pre>
  
  <p>with the error "<strong>init</strong>() takes exactly 2 arguments (5 given)".  I'm pretty sure that it should be taking 5 arguments, not 2 judging from the docs.  Does anyone have an idea for what I may be doing wrong?</p>