fix ClosetHanger.set_quantity to not call destroy on a new hanger; it confuses flex

app/models/closet_hanger.rb

@@ -69,23 +69,28 @@ class ClosetHanger < ActiveRecord::Base
     end
     
     hanger = self.where(conditions).first
-    unless hanger
-      hanger = self.new
-      hanger.user_id = conditions[:user_id]
-      hanger.item_id = conditions[:item_id]
-      # One of the following will be nil, and that's okay. If owned is nil,
-      # we'll cover for it before validation, as always.
-      hanger.owned   = conditions[:owned]
-      hanger.list_id = conditions[:list_id]
-    end
     
-    unless quantity == 0
-      Rails.logger.debug("Logging to #{hanger.id} quantity #{quantity}")
+    if quantity > 0
+      # If quantity is non-zero, create/update the corresponding hanger.
+      
+      unless hanger
+        hanger = self.new
+        hanger.user_id = conditions[:user_id]
+        hanger.item_id = conditions[:item_id]
+        # One of the following will be nil, and that's okay. If owned is nil,
+        # we'll cover for it before validation, as always.
+        hanger.owned   = conditions[:owned]
+        hanger.list_id = conditions[:list_id]
+      end
+      
       hanger.quantity = quantity
       hanger.save!
-    else
-      hanger.destroy if hanger
+    elsif hanger
+      # If quantity is zero and there's a hanger, destroy it.
+      hanger.destroy
     end
+    
+    # If quantity is zero and there's no hanger, good. Do nothing.
   end
 
   protected