Thanks for your help.  create_new_salt is only ever called from within
the the model object.  Here is the only function that calls it:

def initialize(id, address, type)
 @email = address
 @type = type
 @user_id = id
 create_new_salt
 self.key = self.encrypt_key(self.email, self.salt)
end

Perhaps I can't call it until after initialize has run?  Also I still
don't understand why I should call self.salt  in some of these cases
and not @salt.

Thanks,
j


On Aug 13, 11:55 am, "Vishnu Gopal" <g.vis...@[...].com>  wrote:
>  That code seems to be fine. Look at where create_new_salt is being
>  called, it's probably being called on a nil Object instead of an AR
>  model, possible a find condition returning nil instead of the
>  model(s).
> 
>  Vish
> 
>  On 8/13/07, Joshua Kolden <crackcreat...@[...].com> wrote:
> 
> 
> 
>  > 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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