track searches that return no results

app/views/explore/posts/missed_searches.html.erb

@@ -0,0 +1,28 @@
+<div id="c-explore-posts">
+  <div id="a-index">
+    <h1>Missed Searches (past seven days)</h1>
+
+    <table class="striped" width="100%">
+      <thead>
+        <tr>
+          <th>Tags</th>
+          <th style="text-align: right;">Count</th>
+        </tr>
+      </thead>
+      <tbody>
+        <% @search_service.each_search do |tags, count| %>
+          <tr class="category-<%= Tag.category_for(tags) %>">
+            <td><%= link_to tags, posts_path(:tags => tags) %></td>
+            <td style="text-align: right;"><%= count.to_i %></td>
+          </tr>
+        <% end %>
+      </tbody>
+    </table>
+  </div>
+</div>
+
+<%= render "posts/partials/common/secondary_links" %>
+
+<% content_for(:page_title) do %>
+  Missed Searches - <%= Danbooru.config.app_name %>
+<% end %>

app/views/posts/index.html.erb

@@ -59,4 +59,5 @@
   <% if @post_set.has_wiki? %>
     <meta name="description" content="<%= @post_set.wiki_page.presenter.blurb %>"></meta>
   <% end %>
+  <%= missed_post_search_count_js %>
 <% end %>

app/views/posts/partials/common/_search.html.erb

@@ -13,6 +13,7 @@
     <% if params[:random] %>
       <%= hidden_field_tag :random, params[:random] %>
     <% end %>
+    <%= hidden_field_tag "ms", "1" %>
     <%= submit_tag "Go", :name => nil %>
   <% end %>
 </section>

app/views/posts/partials/index/_missed_search_count.html.erb

@@ -0,0 +1,12 @@
+<script type="text/javascript">
+  $(function() {
+    var tags = $("#tags").val();
+    if (Danbooru.get_url_parameter("ms") === "1" && tags && tags.length > 0 && $(".post-preview").size() < 10) {
+      $.post("<%= Danbooru.config.report_server %>/missed_searches", {
+        session_id: "<%= session_id %>",
+        tags: $("#tags").val(),
+        sig: "<%= sig %>"
+      });
+    }
+  });
+</script>