user upgrades: add index action.

app/views/user_upgrades/index.html.erb

@@ -0,0 +1,38 @@
+<div id="c-user-upgrades">
+  <div id="a-index">
+    <%= search_form_for(user_upgrades_path) do |f| %>
+      <%= f.input :recipient_name, label: "Recipient", input_html: { value: params[:search][:recipient_name], data: { autocomplete: "user" } } %>
+      <%= f.input :purchaser_name, label: "Purchaser", input_html: { value: params[:search][:purchaser_name], data: { autocomplete: "user" } } %>
+      <%= f.input :upgrade_type, collection: UserUpgrade.upgrade_types, include_blank: true, selected: params[:search][:upgrade_type] %>
+      <%= f.input :status, collection: UserUpgrade.statuses, include_blank: true, selected: params[:search][:status] %>
+      <%= f.input :is_gifted, label: "Gifted?", as: :select, include_blank: true, selected: params[:search][:is_gifted] %>
+      <%= f.submit "Search" %>
+    <% end %>
+
+    <%= table_for @user_upgrades, class: "striped autofit" do |t| %>
+      <% t.column "Recipient" do |user_upgrade| %>
+        <%= link_to_user user_upgrade.recipient %>
+      <% end %>
+
+      <% t.column "Purchaser" do |user_upgrade| %>
+        <%= link_to_user user_upgrade.purchaser %>
+      <% end %>
+
+      <% t.column :upgrade_type do |user_upgrade| %>
+        <%= user_upgrade.upgrade_type.humanize %>
+      <% end %>
+
+      <% t.column "Gifted?" do |user_upgrade| %>
+        <%= "Yes" if user_upgrade.is_gift? %>
+      <% end %>
+
+      <% t.column :status %>
+
+      <% t.column "Updated" do |artist| %>
+        <%= time_ago_in_words_tagged(artist.updated_at) %>
+      <% end %>
+    <% end %>
+
+    <%= numbered_paginator(@user_upgrades) %>
+  </div>
+</div>