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# config/environment.rb config.gem "cancan" # models/ability.rb class Ability <b style="color:black;background-color:#ffff66">include CanCan</b>::Ability def initialize(user) user ||= User.new # guest user if user.role? :admin can :manage, :all else can :read, :all can :create, Comment can :update, Comment do |comment| comment.try(:user) == user || user.role?(:moderator) end if user.role?(:author) can :create, Article can :update, Article do |article| article.try(:user) == user end end end end end # application_controller.rb rescue_from CanCan::AccessDenied do |exception| flash[:error] = "Access denied." redirect_to root_url end # articles_controller.rb load_and_authorize_resource # comments_controller.rb possibility load_and_authorize_resource :nested => :article

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