I am curious of how to override an existing record in a database via a form.

Take for example a simple input of
db = DAL('sqlite://storage.sqlite')
db.define_table('person',
    Field('email', requires=IS_EMAIL()),
    Field('Your_Zipcode', requires=IS_NOT_EMPTY()),

If the same email address is entered that was previously in the db I get 2
records of the same e-mail.

I don't want to go through the built in auth.  I want to keep it simple.
If the person has to change his/her address s/he can simply fill in the
form and it overrides the existing record.

I get redirected to index when I use the following in the controller.
http://web2py.com/books/default/chapter/29/07/forms-and-validators#SQLFORM-and-insert-update-


What am i missing?

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