added best=N option to get N best comment on a post

app/controllers/posts_controller.rb

@@ -71,7 +71,7 @@ class PostsController < ApplicationController
     post_serializer.draft_sequence = DraftSequence.current(current_user, post.topic.draft_key)
     link_counts = TopicLinkClick.counts_for(post.topic, [post])
     post_serializer.single_post_link_counts = link_counts[post.id] if link_counts.present?
-
+    post_serializer.topic_slug = post.topic.slug if post.topic.present?
 
     result = {post: post_serializer.as_json}
     if revisor.category_changed.present?

app/controllers/topics_controller.rb

@@ -168,7 +168,7 @@ class TopicsController < ApplicationController
   private
 
   def create_topic_view
-    opts = params.slice(:username_filters, :best_of, :page, :post_number, :posts_before, :posts_after)
+    opts = params.slice(:username_filters, :best_of, :page, :post_number, :posts_before, :posts_after, :best)
     @topic_view = TopicView.new(params[:id] || params[:topic_id], current_user, opts)
   end
 

lib/topic_view.rb

@@ -20,6 +20,8 @@ class TopicView
     Guardian.new(user).ensure_can_see!(@topic)
     @post_number, @page  = options[:post_number], options[:page]
 
+    @limit = options[:limit] || SiteSetting.posts_per_page;
+
     @filtered_posts = @topic.posts
     @filtered_posts = @filtered_posts.with_deleted if user.try(:admin?)
     @filtered_posts = @filtered_posts.best_of if options[:best_of].present?
@@ -91,13 +93,16 @@ class TopicView
     return filter_posts_near(opts[:post_number].to_i) if opts[:post_number].present?
     return filter_posts_before(opts[:posts_before].to_i) if opts[:posts_before].present?
     return filter_posts_after(opts[:posts_after].to_i) if opts[:posts_after].present?
+    return filter_best(opts[:best]) if opts[:best].present?
     filter_posts_paged(opts[:page].to_i)
   end
 
+
   # Find the sort order for a post in the topic
   def sort_order_for_post_number(post_number)
     Post.where(topic_id: @topic.id, post_number: post_number)
         .with_deleted
+        .select(:sort_order)
         .first
         .try(:sort_order)
   end
@@ -148,14 +153,12 @@ class TopicView
     sort_order = sort_order_for_post_number(post_number)
     return nil unless sort_order
 
-
-
     # Find posts before the `sort_order`
     @posts = @filtered_posts.order('sort_order desc').where("sort_order < ?", sort_order)
     @index_offset = @posts.count
     @index_reverse = true
 
-    @posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(SiteSetting.posts_per_page)
+    @posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(@limit)
   end
 
   # Filter to all posts after a particular post number
@@ -167,7 +170,16 @@ class TopicView
 
     @index_offset = @filtered_posts.where("sort_order <= ?", sort_order).count
     @posts = @filtered_posts.order('sort_order').where("sort_order > ?", sort_order)
-    @posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(SiteSetting.posts_per_page)
+    @posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(@limit)
+  end
+  
+  def filter_best(max)
+    @index_offset = 0
+    @posts = @filtered_posts.order('percent_rank asc, sort_order asc').where("post_number > 1")
+    @posts = @posts.includes(:reply_to_user).includes(:topic).joins(:user).limit(max)
+    @posts = @posts.to_a
+    @posts.sort!{|a,b| a.post_number <=> b.post_number}
+    @posts
   end
 
   def read?(post_number)

spec/components/topic_view_spec.rb

@@ -19,15 +19,22 @@ describe TopicView do
   end
 
   context "with a few sample posts" do
-    let!(:p1) { Fabricate(:post, topic: topic, user: first_poster )}
-    let!(:p2) { Fabricate(:post, topic: topic, user: coding_horror )}
-    let!(:p3) { Fabricate(:post, topic: topic, user: first_poster )}
+    let!(:p1) { Fabricate(:post, topic: topic, user: first_poster, percent_rank: 1 )}
+    let!(:p2) { Fabricate(:post, topic: topic, user: coding_horror, percent_rank: 0.5 )}
+    let!(:p3) { Fabricate(:post, topic: topic, user: first_poster, percent_rank: 0 )}
+
+    it "it can the best 2 responses" do
+      best2 = TopicView.new(topic.id, nil, best: 2)
+      best2.posts.count.should == 2
+      best2.posts[0].id.should == p2.id
+      best2.posts[1].id.should == p3.id
+    end
 
 
-  it "raises NotLoggedIn if the user isn't logged in and is trying to view a private message" do
-    Topic.any_instance.expects(:private_message?).returns(true)
-    lambda { TopicView.new(topic.id, nil) }.should raise_error(Discourse::NotLoggedIn)
-  end
+    it "raises NotLoggedIn if the user isn't logged in and is trying to view a private message" do
+      Topic.any_instance.expects(:private_message?).returns(true)
+      lambda { TopicView.new(topic.id, nil) }.should raise_error(Discourse::NotLoggedIn)
+    end
 
     it "provides an absolute url" do
       topic_view.absolute_url.should be_present