ability.rb

class Ability
  include CanCan::Ability

  def initialize(user)
    if user
      can :create, [Question, Answer, Attachment, Comment]

      can %i[update destroy], [Question, Answer], user_id: user.id
      can :destroy, Comment, user_id: user.id
      can :destroy, Attachment, attachable: { user_id: user.id }
      can :set_best, Answer, question: { user_id: user.id }

      can %i[vote_up vote_down], Vote, votable: { user_id: user.id }
      # can %i[vote_up vote_down], [Question, Answer] do |votable|
        # !user.author_of?(votable)# && votable.voted_by(user).empty?
        # votable.user_id != user.id
      # end

      can :cancel_vote, [Question, Answer], user_id: user.id

    end
    can :read, :all
  end
end