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
<         


        

Answer 1

Add somewhere this:

User._meta.get_field_by_name('email')[0]._unique = True     

and then execute SQL similar to this:

ALTER TABLE auth_user ADD UNIQUE (email);