How to change a password in ROR if using acts_as_authentic

I am using the plugin acts_as_authentic!Then i want to design a page to change the password!And I don't know how to deal with it! First,how to test and ve开发者_开发知识库rify the old password? Then,when it gets wrong ,does any validations should be made? sorry for My poor English! Maybe I don't make it clear! Any comments would be appreciated! Thank you very much!

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I user auth logic, but checking the old password is just the same. Your User model should have a salt field, so all you need to do is encrypt the string

params[:password] + current_user.salt

using whatever encryption acts_as_authentic is configured to use. You can check what your Users' salt field is called simply by using the rails console and typing User.new. Hope that helps.