Simplify item_link rendering

In the interest of clearing out Resque, I'm just gonna remove a lot of our more complex caching stuff, and we can do a perf pass for things like big item list pages once everything's upgraded. (I'm hopeful that the upgrades themselves improve perf; and if not, that some improved sensibilities 10 years later can find simpler approaches.)

app/controllers/closet_hangers_controller.rb

@@ -44,14 +44,11 @@ class ClosetHangersController < ApplicationController
     visible_groups = @user.closet_hangers_groups_visible_to(@perspective_user)
     @unlisted_closet_hangers_by_owned = find_unlisted_closet_hangers_by_owned(visible_groups)
 
-    item_proxies = Item::ProxyArray.new
     items = []
 
     @closet_lists_by_owned.each do |owned, lists|
       lists.each do |list|
         list.hangers.each do |hanger|
-          hanger.item_proxy = Item::Proxy.new(hanger.item)
-          item_proxies << hanger.item_proxy
           items << hanger.item
         end
       end
@@ -59,14 +56,10 @@ class ClosetHangersController < ApplicationController
 
     @unlisted_closet_hangers_by_owned.each do |owned, hangers|
       hangers.each do |hanger|
-        hanger.item_proxy = Item::Proxy.new(hanger.item)
-        item_proxies << hanger.item_proxy
         items << hanger.item
       end
     end
 
-    item_proxies.prepare_partial(:item_link_partial)
-
     if @public_perspective && user_signed_in?
       current_user.assign_closeted_to_items!(items)
     end

app/helpers/items_helper.rb

@@ -116,27 +116,7 @@ module ItemsHelper
   end
 
   def render_item_link(item)
-    # I've discovered that checking the cache *before* attempting to render the
+    render(partial: 'items/item_link', locals: {item: item})
-    # partial is significantly faster: moving the cache line out here instead
-    # of having it wrap the partial's content speeds up closet_hangers#index
-    # rendering time by about a factor of 2. It's uglier, but this call happens
-    # a lot, so the performance gain is definitely worth it. I'd be interested
-    # in a more legit partial caching abstraction, but, for now, this will do.
-    # Because this is a returned-string helper, but uses a buffer-output
-    # helper, we have to do some indirection. Fake that the render is in a
-    # template, then capture the resulting buffer output.
-    capture do
-      # Try to read from the prepared proxy's known partial output, if it's
-      # even a proxy at all.
-      if item.respond_to?(:known_partial_output)
-        prepared_output = item.known_partial_output(:item_link_partial).try(:html_safe)
-      else
-        prepared_output = nil
-      end
-      prepared_output || localized_cache("items/#{item.id}#item_link_partial") do
-        safe_concat render(partial: 'items/item_link', locals: {item: item})
-      end
-    end
   end
 
   private

app/models/closet_hanger.rb

@@ -3,8 +3,6 @@ class ClosetHanger < ActiveRecord::Base
   belongs_to :list, :class_name => 'ClosetList'
   belongs_to :user
 
-  attr_accessor :item_proxy
-
   delegate :name, to: :item, prefix: true
 
   validates :item_id, :uniqueness => {:scope => [:user_id, :owned, :list_id]}

app/models/item/proxy_array.rb

@@ -6,9 +6,6 @@ class Item
     SCOPES = HashWithIndifferentAccess.new({
       method: {
         as_json: Item.includes(:translations),
-      },
-      partial: {
-        item_link_partial: Item.includes(:translations)
       }
     })
 

app/models/item/update_task.rb

@@ -16,7 +16,6 @@ class Item
     private
 
     def self.expire_cache_for(item)
-      expire_fragment_in_all_locales("items/#{item.id}#item_link_partial")
       expire_fragment_in_all_locales("items/#{item.id} header")
       expire_fragment_in_all_locales("items/#{item.id} info")
       expire_key_in_all_locales("items/#{item.id}#as_json")

app/views/closet_hangers/_closet_hanger.html.haml

@@ -1,4 +1,4 @@
 %div{'class' => closet_hanger_partial_class(closet_hanger), 'data-item-id' => closet_hanger.item_id, 'data-quantity' => closet_hanger.quantity, 'data-id' => closet_hanger.id}
-  = render_item_link(closet_hanger.item_proxy || closet_hanger.item)
+  = render_item_link(closet_hanger.item)
   .quantity{:class => "quantity-#{closet_hanger.quantity}"}
     %span= closet_hanger.quantity