diff --git a/app/models/closet_hanger_observer.rb b/app/models/closet_hanger_observer.rb
new file mode 100644
index 00000000..b00938e0
--- /dev/null
+++ b/app/models/closet_hanger_observer.rb
@@ -0,0 +1,20 @@
+class ClosetHangerObserver < ActionController::Caching::Sweeper
+  extend FragmentExpiration
+
+  def after_create(hanger)
+    self.class.expire_item_trade_hangers(hanger) if hanger.trading?
+  end
+
+  def after_update(hanger)
+    self.class.expire_item_trade_hangers(hanger) if hanger.list_id_changed?
+  end
+
+  def after_destroy(hanger)
+    self.class.expire_item_trade_hangers(hanger) if hanger.trading?
+  end
+
+  def self.expire_item_trade_hangers(hanger)
+    expire_fragment_in_all_locales("items/#{hanger.item_id} trade_hangers")
+    expire_fragment_in_all_locales("items/#{hanger.item_id} trade_hangers owned=#{hanger.owned}")
+  end
+end
diff --git a/app/models/closet_list_observer.rb b/app/models/closet_list_observer.rb
new file mode 100644
index 00000000..a1be4910
--- /dev/null
+++ b/app/models/closet_list_observer.rb
@@ -0,0 +1,18 @@
+class ClosetListObserver < ActionController::Caching::Sweeper
+  include FragmentExpiration
+
+  def after_update(list)
+    expire_all_items_trade_hangers(list) if list.trading_changed?
+  end
+
+  def before_destroy(list)
+    # Nullify all the child records explicitly, which will in turn trigger
+    # their update callbacks and expire their items' caches. This occurs in the
+    # same transaction as the list's destruction.
+    list.hangers.each { |h| h.list_id = nil; h.save! }
+  end
+
+  def expire_all_items_trade_hangers(list)
+    list.hangers.each { |h| ClosetHangerObserver.expire_item_trade_hangers(h) }
+  end
+end
\ No newline at end of file