Ruby on Rails

Hi Guys,

I'm experimenting with my first rails app currently. One thing I'm
trying to implement is a login system.

I created a model for user.rb I've added a couple of functions to the
class for example:

def self.authenticate(user_info)
find_by_username_and_password(....,
self.hashed_password(user_info[:password]))
end

def self.hashed_password(password)
Digest::SHA2.hexdigest(password)
end

So from user.rb function self.authenticate I can call
self.hashed_password and it works fine.

From another file (user_controller.rb) I try to create a new user
based on the authentication parameters, and then call authenticate on
that user. In order to do that I have to call
user_into.class.authenticate instead of user_info.authenticate...

I don't understand what is going on here with def self.{function} and
the .class modifier.

Can someone point to me somewhere to explain? I have a feeling I'm
doing something wrong but I don't understand what.

Thanks

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