Abilities are defined in the Ability class using can and cannot methods.
Example:
class Ability
include CanCan::Ability
def initialize(user)
# for any visitor or user
can :read, Article
if user
if user.admin?
# admins can do any action on any model or action
can :manage, :all
else
# regular users can read all content
can :read, :all
# and edit, update and destroy their own user only
can [:edit, :destroy], User, id: user_id
# but cannot read hidden articles
cannot :read, Article, hidden: true
end
else
# only unlogged visitors can visit a sign_up page:
can :read, :sign_up
end
end
end
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