[Rails Notes] Doubly polymorphic has_many: :through association [Rails Notes] Doubly polymorphic has_many: :through association By Sky Xu | April 7, 2019 Double-ended polymorphic has_many: :through association in Ruby on Rails. ShareClick to print (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Pocket (Opens in new window)Click to share on Telegram (Opens in new window)Click to share on WhatsApp (Opens in new window)