Basic trade hangers page, just content and without style

We're just getting started but there we go!! No links or styles yet,
just getting it done!

app/assets/stylesheets/_items.sass

@@ -1,6 +1,6 @@
 @import "partials/campaign-progress"
 
-body.items
+body.items, body.item_trades
   +campaign-progress
 
   text-align: center

app/controllers/item_trades_controller.rb

@@ -0,0 +1,25 @@
+class ItemTradesController < ApplicationController
+	def index
+		@item = Item.find params[:item_id]
+
+		@type = type_from_params
+
+		@item_trades = @item.closet_hangers.trading.includes(:user, :list).
+			user_is_active.order('users.last_trade_activity_at DESC').to_trades
+
+		@trades = @item_trades[@type]
+
+		render layout: 'items'
+	end
+
+	def type_from_params
+		case params[:type]
+		when 'offering'
+			:offering
+		when 'seeking'
+			:seeking
+		else
+			raise ArgumentError, "unexpected trades type: #{params[:type].inspect}"
+		end
+	end
+end

app/helpers/item_trades_helper.rb

@@ -0,0 +1,2 @@
+module ItemTradesHelper
+end

app/models/closet_hanger.rb

@@ -161,12 +161,6 @@ class ClosetHanger < ApplicationRecord
   #
   # We don't preload anything here - if you want user names or list names, you
   # should `includes` them in the hanger scope first, to avoid extra queries!
-  Trade = Struct.new('Trade', :user_id, :hangers) do
-    def user
-      # Take advantage of `includes(:user)` on the hangers, if applied.
-      hangers.first.user
-    end
-  end
   def self.to_trades
     # Let's ensure that the `trading` filter is applied, to avoid data leaks.
     # (I still recommend doing it at the call site too for clarity, though!)
@@ -185,6 +179,17 @@ class ClosetHanger < ApplicationRecord
     {offering: offering, seeking: seeking}
   end
 
+  Trade = Struct.new('Trade', :user_id, :hangers) do
+    def user
+      # Take advantage of `includes(:user)` on the hangers, if applied.
+      hangers.first.user
+    end
+
+    def lists
+      hangers.map(&:list).filter(&:present?)
+    end
+  end
+
   protected
 
   def list_belongs_to_user

app/views/item_trades/index.html.haml

@@ -0,0 +1,30 @@
+- title t(".title.#{@type}")
+- hide_title_header
+
+%h2.item-page-subtitle= t(".title.#{@type}")
+
+- if @trades.present?
+	%table
+		%thead
+			%tr
+				%th= t(".table.headings.last_active")
+				%th= t(".table.headings.user.#{@type}")
+				%th= t(".table.headings.lists")
+		%tbody
+			- @trades.each do |trade|
+				%tr
+					%td
+						-# TODO: Replace this with the coarse-grained version from 2020,
+						-# and translate it!
+						= time_ago_in_words trade.user.last_trade_activity_at
+						ago
+					%td= trade.user.name
+					%td
+						- if trade.lists.present?
+							%ul
+								- trade.lists.each do |list|
+									%li= list.name
+						- else
+							%span.not-in-a-list= t(".table.not_in_a_list")
+- else
+	%p= t(".no_trades_yet")

config/locales/en.yml

@@ -369,6 +369,23 @@ en:
         user_wants: wants
         fits_pet_type: fits
 
+  item_trades:
+    index:
+      title:
+        offering: "Trades: Offering"
+        seeking: "Trades: Seeking"
+      table:
+        headings:
+          last_active: Last active
+          user:
+            offering: Owner
+            seeking: Seeker
+          lists: Lists
+        not_in_a_list: Not in a list
+      no_trades_yet:
+        No trades yet! To add your name to this page, add this item to one of
+        your lists, and mark the list as "Trading".
+
   neopets_page_import_tasks:
     create:
       success: Page %{index} saved!

config/routes.rb

@@ -18,7 +18,11 @@ OpenneoImpressItems::Application.routes.draw do
 
   # Our customization data! Both the item pages, and JSON API endpoints.
   resources :items, :only => [:index, :show] do
+    resources :trades, path: 'trades/:type', controller: 'item_trades',
+      only: [:index], constraints: {type: ['offering', 'seeking']}
+
     resources :appearances, controller: 'item_appearances', only: [:index]
+
     collection do
       get :needed
     end