add dynamic sitemap.xml

app/views/static/sitemap.xml.erb

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
+   xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
+   <url>
+      <loc><%= posts_url %></loc>
+      <changefreq>daily</changefreq>
+   </url>
+   <url>
+      <loc><%= wiki_pages_url %></loc>
+      <changefreq>daily</changefreq>
+   </url>
+   <url>
+      <loc><%= pools_url %></loc>
+      <changefreq>daily</changefreq>
+   </url>
+
+   <%# cache("sitemap", :expires_in => 24.hours) do %>
+      <% @popular_search_service.each_search do |tags, count| %>
+         <url>
+            <loc><%= posts_url(tags: tags) %></loc>
+            <lastmod><%= Date.today %></lastmod>
+         </url>
+      <% end %>
+
+      <% @posts.each do |post| %>
+         <url>
+            <loc><%= post_url(post) %></loc>
+            <image:image>
+               <image:loc>
+                  <%= post.file_url %>
+               </image:loc>
+               <image:caption>
+                  <%= post.presenter.humanized_essential_tag_string %>
+               </image:caption>
+            </image:image>
+            <lastmod><%= post.created_at.to_date %></lastmod>
+         </url>
+      <% end %>
+   <%# end %>
+</urlset>