I'm pretty new to ruby and rails BUT, I've had problems in the past
like this when I didn't set the variable up with the attr_accessible
in the model...

when you try to access the remember_token in the SessionHelper, is it
in scope without the attribute set up or is that why you're getting
nil?

try adding

attr_accessible :remember_token

to the top of your model and see if that helps...

I'd also add a

fail self.inspect in the callback after you make the assignment to
see:
1. that it's getting there
2. if the value is being set to something other than nil

just some thoughts from a noob

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