Refactor how we load closet hangers

Ahh I see, the way we got away with not having a `trading` scope before
was a weird metaprogramming `{owned/wanted}_trading` situation. Okay,
let's trash that in favor of our new stuff! And that helps us bulk the
queries too which is nice.

app/controllers/items_controller.rb

@@ -71,9 +71,12 @@ class ItemsController < ApplicationController
         @basic_colored_pet_types_by_species_id = PetType.special_color_or_basic(@item.special_color).
           includes_child_translations.group_by(&:species)
 
+        trading_closet_hangers = @item.closet_hangers.trading.newest.
+          includes(:user)
+
         @trading_closet_hangers_by_owned = {
-          true => @item.closet_hangers.owned_trading.newest.includes(:user),
-          false => @item.closet_hangers.wanted_trading.newest.includes(:user)
+          true => trading_closet_hangers.filter { |c| c.owned? },
+          false => trading_closet_hangers.filter { |c| c.wanted? },
         }
 
         if user_signed_in?

app/models/closet_hanger.rb

@@ -47,20 +47,6 @@ class ClosetHanger < ApplicationRecord
   scope :owned_before_wanted, -> { order(arel_table[:owned].desc) }
   scope :unlisted, -> { where(:list_id => nil) }
 
-  {:owned => true, :wanted => false}.each do |name, owned|
-    scope "#{name}_trading", -> {
-      joins(:user).includes(:list).
-        where(:owned => owned).
-        where((
-          arel_table[:list_id].eq(nil).and(
-            User.arel_table["#{name}_closet_hangers_visibility"].gteq(ClosetVisibility[:trading].id)
-          )
-          ).or(
-          ClosetList.arel_table[:visibility].gteq(ClosetVisibility[:trading].id)
-        ))
-      }
-  end
-
   before_validation :merge_quantities, :set_owned_by_list
 
   after_save :log_trade_activity, if: :trading?
@@ -74,6 +60,10 @@ class ClosetHanger < ApplicationRecord
     possibly_null_closet_list.trading?
   end
 
+  def wanted?
+    !owned?
+  end
+
   def possibly_null_list_id=(list_id_or_owned)
     if list_id_or_owned.to_s == 'true' || list_id_or_owned.to_s == 'false'
       self.list_id = nil