I am working on an application that includes the following in
models.py:
class UserEmail(models.Model):
email = models.EmailField("email address", unique=True,
editable=False)
user = models.ForeignKey(UserRegistration)
# an email address can only be associated with one user, and can
never
# be deleted
# once assigned to a user, it can be shifted to another user only
by
# manual intervention by an administrator
def delete(self):
"Deletion of email addresses is not permitted"
warnings.warn("Attempt to delete registered email %s
rejected."
% self.email)
def __str__(self):
return self.email
class Admin:
pass
Basically, I want to keep track of every email address that has ever
been registered with my app, to prevent duplication. By overriding
delete(), I prevent any address from being removed from the database,
but I also have to prevent editing the address once it has been
registered. The problem is that "editable=False" works too well -- it
prevents an admin from editing an existing address, but also prevents
them from adding new ones. Is there a way to set up my model so that
the administrator can enter new email addresses for a user, but cannot
change the existing ones?
Russ
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