User related typical policy

user_related_policy.rb

module UserRelatedPolicy

  def user_from_resource
    fail 'Policies including UserRelatedPolicy MUST implement the method user_from_resource()'
  end

  def index?
    true
  end

  def new?
    create?
  end

  def create?
    true
  end


  def show?
    user_match_user_from_resource?
  end

  def edit?
    update?
  end

  def update?
    user_match_user_from_resource?
  end

  def destroy?
    user_match_user_from_resource?
  end

  private

  def user_match_user_from_resource?
    user_from_resource == user
  end


end