Recommend posts on /posts/show based on voting patterns

app/logical/post_sets/similar.rb

@@ -0,0 +1,19 @@
+module PostSets
+  class Similar < PostSets::Post
+    def initialize(post)
+      super(tags)
+    end
+
+    def posts
+      @posts ||= begin
+        post_ids, scores = RecommenderService.similar(post)
+        post_ids = post_ids.reject {|x| x == post.id}.slice(0, 5)
+        Post.find(post_ids)
+      end
+    end
+
+    def presenter
+      ::Presenters::PostSetPresenters::Post.new(self)
+    end
+  end
+end