Lengthening Django Username

I'm using this snippet, that allows users to only need to enter an email address to register for my app: http://djangosnippets.org/snippets/686/

Things are almost working perfectly. The problem is when a user has an email address that's above 30 characters. I get a "Ensure this value has at most 30 characters (it has 40)." error.

This is because the username is only supposed to be 30 characters. Is there a simple way to just tell Django that the username can be longer? It seems like there shoul开发者_C百科d be a fairly straightforward override for this.

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This actually isn't simple at all. This requires subclassing the User model and using that everywhere. I've never had to do it, for this case, but it would likely cause significant issues with the Admin interface. You could also edit django's source to pull it off (ick).

Or even use this solution: Can django's auth_user.username be varchar(75)? How could that be done?

It's quite ugly though.

You're probably better off writing an authentication backend to use the email field for authentication rather than using the username field. To populate the username (which is required) then you'd just generate some sort of random unique username maybe by hashing or using a UUID.

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Hopefully this solution should help you : http://www.micahcarrick.com/django-email-authentication.html