[Rails] Getting started w/ Rails 4

Hi. I'm trying to run Getting started tutorial under Rails 4.0.0.beta1
although it assumes it runs on Rails 3. I was able to get rid of all
errors by wrapping post_params here and there, and installing
protected_attributes Gem for attr_accessible to make sense. Post/
comment CRUD works just fine, but I don't seem to be able to add Tags
(the final part of the tutorial). Post saved successfully message
appears, but tags aren't saved as part of saving the post. Database
isn't even UPDATEd unless I change either name, title or content, but
tags aren't persisted in any case. What gives?

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