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Asked: 2026-05-19T15:27:41+00:00

Before somebody marks this question as a duplicate of this question Can django’s auth_user.username

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Before somebody marks this question as a duplicate of this question Can django’s auth_user.username be varchar(75)? How could that be done? or other such questions on SO, please read this question. The question I linked to asks this question precisely but unfortunately the answers don’t address the question that was asked.

Can I change the auth_user.username field to be 100 characters long by doing the following:

  1. Run ALTER table in DB for the username field
  2. Change the max_length here: username = models.CharField(_('username'), max_length=30, unique=True, help_text=_("Required. 30 characters or fewer. Letters, numbers and @/./+/-/_ characters"))

Would it break anything in Django if I were to do this?

That this will break when I update Django to a higher version is not a problem. I’m also not looking at writing other authentication methods.I just want to know if I would break anything if I were to do this.

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1 Answer

  1. Editorial Team

    You need to monkey-patch max-length in several places: model-field’s description, form-field’s description and max-length validators. Max-length validators are attached to form-fields as well as model-fields.

    Here is a code snippet, which will patch everything:

    https://gist.github.com/1143957 (tested with django 1.2 and 1.3)

    Update:
    Good news! Since django 1.5 you can override user model: Customizing the User model

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