How to make email field unique in model User from contrib.auth in Django

Question

I need to patch the standard User model of contrib.auth by ensuring the email field entry is unique:

User._meta.fields[4].unique = True
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Answer 1

Add the below function in any of the models.py file. Then run makemigrations and migrate. Tested on Django1.7

def set_email_as_unique():
    """
    Sets the email field as unique=True in auth.User Model
    """
    email_field = dict([(field.name, field) for field in MyUser._meta.fields])["email"]
    setattr(email_field, '_unique', True)

#this is called here so that attribute can be set at the application load time
set_email_as_unique()