[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. Share Click to print (Opens in new window) Print Click to share on Facebook (Opens in new window) Facebook Click to share on LinkedIn (Opens in new window) LinkedIn Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to share on Tumblr (Opens in new window) Tumblr Click to share on Pinterest (Opens in new window) Pinterest Click to share on Pocket (Opens in new window) Pocket Click to share on Telegram (Opens in new window) Telegram Click to share on WhatsApp (Opens in new window) WhatsApp