laravel/framework — pull request #5597 by hammat (2014-08-29 12:21:24+00:00)
Title: Ensure to propagate touchOwner on relationships.

Considering the following relationships: Album 1 <-> n Article 1 <-> n Lang

Article belongsTo Album
Lang belongsTo Article

Using the $touches protected attribute of Eloquent model, when updating a Lang, it touches its Article as well but doesn't update the related Album.