reduce fav requirement to 300, show score in similar user report

app/assets/stylesheets/specific/reports.css.scss

@@ -8,6 +8,10 @@
       margin-bottom: 2em;
     }
 
+    span.accuracy {
+      color: #666;
+    }
+
     /* clearfix hacks */
     div.box:before, div.box:after {
       content: "";

app/presenters/user_similarity_presenter.rb

@@ -1,5 +1,5 @@
 class UserSimilarityPresenter
-  attr_reader :report, :user_ids, :not_ready
+  attr_reader :report, :user_ids, :user_ids_with_scores, :not_ready
 
   def initialize(report)
     @report = report
@@ -11,21 +11,31 @@ class UserSimilarityPresenter
   end
 
   def insufficient_data?
-    report.user.favorite_count < 500
+    report.user.favorite_count < 300
   end
 
   def fetch
-    user_ids = report.fetch_similar_user_ids
+    data = report.fetch_similar_user_ids
 
-    if user_ids == "not ready"
+    if data == "not ready"
       @not_ready = true
     else
-      @user_ids = user_ids.scan(/\d+/).slice(0, 10)
+      @user_ids_with_scores = data.scan(/\S+/).in_groups_of(2)
     end
   end
 
+  def user_ids
+    user_ids_with_scores.map(&:first)
+  end
+
+  def scores
+    user_ids_with_scores.map(&:last)
+  end
+
   def each_user(&block)
-    User.where(id: user_ids).each(&block)
+    user_ids_with_scores.each do |user_id, score|
+      yield(User.find(user_id), 100 * score.to_f)
+    end
   end
 
   def each_favorite_for(user, &block)

app/views/reports/similar_users.html.erb

@@ -3,15 +3,15 @@
     <h1>Similar Users</h1>
 
     <% if @presenter.insufficient_data? %>
-      <p>You need at least 500 favorites before Danbooru can calculate users similar to you.</p>
+      <p>You need at least 300 favorites before Danbooru can calculate users similar to you.</p>
 
     <% elsif @presenter.not_ready? %>
       <p>The report is still being generated. Check back in a few minutes.</p>
 
     <% else %>
-      <% @presenter.each_user do |user| %>
+      <% @presenter.each_user do |user, score| %>
         <div class="box">
-          <h2><%= link_to user.pretty_name, user_path(user) %></h2>
+          <h2><%= link_to user.pretty_name, user_path(user) %> <span class="accuracy">(<%= number_to_percentage score, :precision => 2 %>)</span></h2>
           <div>
             <% @presenter.each_favorite_for(user) do |post| %>
               <%= PostPresenter.preview(post, :tags => "fav:#{user.name}") %>