post:

  published:
    when: :state_changed?
    if: :published?
    to: :author
    link: post_path(:self)
    message: Your post has been published.

comment:

  new:
    when: :create
    to: :post_author
    from: :user
    link: post_path(:post)
    message: '{user.to_s} left a new comment on your post.'
    update:
      strategy: :sender
      scope: :post