I'm working on an application that creates a confirmation e.mail
whenever you create and account or change an e.mail address.  I
thought I'd just use the same key generation code used for the
password hash login example from the Agile Rails book.

The function to create a salt value keeps failing complaining I have a
nil object where I don't expect it.

The code where it breaks is:

def create_new_salt
    self.salt = @user_id.to_s + rand.to_s
end

I've also put a constant string assigned to self.salt, but the error
still occurs, as if self.salt points to a nil object, but I don't see
how that can happen.  I also don't understand any reason for this
function to call self.salt, instead of @salt.  Any clues would be much
appreciated.

Thanks,
j

PS here is the table definition for this model.

:created_at, :timestamp
:email, :string
:type, :string  #which of several e.mail columns in 'user' does this
change apply to
:user_id, integer
:key, :string #randomly generated key
:salt, :string


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